fortran: Fix up gfc_trans_oacc_construct [PR104717]

So that move_sese_region_to_fn works properly, OpenMP/OpenACC constructs
for which that function is invoked need an extra artificial BIND_EXPR
around their body so that we move all variables of the bodies.

The C/C++ FEs do that both for OpenMP constructs like OMP_PARALLEL, OMP_TASK
or OMP_TARGET and for OpenACC constructs that behave similarly to
OMP_TARGET, but the Fortran FE only does that for OpenMP constructs.

The following patch does that for OpenACC constructs too.

	PR fortran/104717
	gcc/fortran/
	* trans-openmp.cc (gfc_trans_oacc_construct): Wrap construct body
	in an extra BIND_EXPR.
	gcc/testsuite/
	* gfortran.dg/goacc/pr104717.f90: New test.
	* gfortran.dg/goacc/privatization-1-compute-loop.f90: Adjust.
	libgomp/
	* testsuite/libgomp.oacc-fortran/privatized-ref-2.f90: Adjust.

Co-authored-by: Thomas Schwinge <thomas@codesourcery.com>

gcc/fortran/trans-openmp.cc

@@ -4444,7 +4444,9 @@ gfc_trans_oacc_construct (gfc_code *code)
   gfc_start_block (&block);
   oacc_clauses = gfc_trans_omp_clauses (&block, code->ext.omp_clauses,
 					code->loc, false, true);
+  pushlevel ();
   stmt = gfc_trans_omp_code (code->block->next, true);
+  stmt = build3_v (BIND_EXPR, NULL, stmt, poplevel (1, 0));
   stmt = build2_loc (gfc_get_location (&code->loc), construct_code,
 		     void_type_node, stmt, oacc_clauses);
   gfc_add_expr_to_block (&block, stmt);

gcc/testsuite/gfortran.dg/goacc/pr104717.f90

@@ -0,0 +1,22 @@
+! Extracted from 'libgomp.oacc-fortran/privatized-ref-2.f90'.
+
+! { dg-additional-options "-O1 -fstack-arrays -fipa-pta" }
+
+program main
+  implicit none (type, external)
+  integer :: j
+  integer, allocatable :: A(:)
+
+  A = [(3*j, j=1, 10)]
+  call foo (A, size(A))
+  deallocate (A)
+contains
+  subroutine foo (array, nn)
+    integer :: i, nn
+    integer :: array(nn)
+
+    !$acc parallel copyout(array)
+    array = [(-i, i = 1, nn)]
+    !$acc end parallel
+  end subroutine foo
+end

gcc/testsuite/gfortran.dg/goacc/privatization-1-compute-loop.f90

@@ -13,7 +13,7 @@
 ! passed to 'incr' may be unset, and in that case, it will be set to [...]",
 ! so to maintain compatibility with earlier Tcl releases, we manually
 ! initialize counter variables:
-! { dg-line l_dummy[variable c_loop 0] }
+! { dg-line l_dummy[variable c_compute 0 c_loop 0] }
 ! { dg-message "dummy" "" { target iN-VAl-Id } l_dummy } to avoid
 ! "WARNING: dg-line var l_dummy defined, but not used".
 
@@ -26,7 +26,7 @@ contains
     integer, parameter :: c = 3
     integer, external :: g
 
-    !$acc parallel
+    !$acc parallel ! { dg-line l_compute[incr c_compute] }
     !$acc loop collapse(2) private(a) private(x, y) ! { dg-line l_loop[incr c_loop] }
     do i = 1, 20
        do j = 1, 25
@@ -46,6 +46,8 @@ contains
           y = a
        end do
     end do
+    !$acc end parallel
+    ! { dg-note {variable 'count\.[0-9]+' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } l_compute$c_compute }
     ! { dg-note {variable 'count\.[0-9]+' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } l_loop$c_loop }
     ! { dg-note {variable 'i' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } l_loop$c_loop }
     ! { dg-note {variable 'j' in 'private' clause isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } l_loop$c_loop }
@@ -54,6 +56,5 @@ contains
     ! { dg-note {variable 'y' in 'private' clause is candidate for adjusting OpenACC privatization level} "" { target *-*-* } l_loop$c_loop }
     ! { dg-note {variable 'C\.[0-9]+' declared in block potentially has improper OpenACC privatization level: 'const_decl'} "TODO" { target *-*-* } l_loop$c_loop }
     ! { dg-note {variable 'y' ought to be adjusted for OpenACC privatization level: 'vector'} "" { target *-*-* } l_loop$c_loop }
-    !$acc end parallel
   end subroutine f
 end module m

libgomp/testsuite/libgomp.oacc-fortran/privatized-ref-2.f90

@@ -53,6 +53,9 @@ contains
     integer :: array(nn)
 
     !$acc parallel copyout(array) ! { dg-line l_compute[incr c_compute] }
+    ! { dg-note {variable 'atmp\.[0-9]+' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } l_compute$c_compute }
+    ! { dg-note {variable 'shadow_loopvar\.[0-9]+' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } l_compute$c_compute }
+    ! { dg-note {variable 'offset\.[0-9]+' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } l_compute$c_compute }
     ! { dg-note {variable 'S\.[0-9]+' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } l_compute$c_compute }
     array = [(-i, i = 1, nn)]
     !$acc end parallel
@@ -81,6 +84,10 @@ contains
     integer :: array(:)
 
     !$acc parallel copyout(array) ! { dg-line l_compute[incr c_compute] }
+    ! { dg-note {variable 'atmp\.[0-9]+' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } l_compute$c_compute }
+    ! { dg-note {variable 'parm\.[0-9]+' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } l_compute$c_compute }
+    ! { dg-note {variable 'shadow_loopvar\.[0-9]+' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } l_compute$c_compute }
+    ! { dg-note {variable 'offset\.[0-9]+' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } l_compute$c_compute }
     ! { dg-note {variable 'S\.[0-9]+' declared in block isn't candidate for adjusting OpenACC privatization level: not addressable} "" { target *-*-* } l_compute$c_compute }
     array = [(-2*i, i = 1, size(array))]
     !$acc end parallel