Fortran: error recovery on invalid ARRAY argument to FINDLOC [PR106986]

gcc/fortran/ChangeLog:

	PR fortran/106986
	* simplify.cc (gfc_simplify_findloc): Do not try to simplify
	intrinsic FINDLOC when the ARRAY argument has a NULL shape.

gcc/testsuite/ChangeLog:

	PR fortran/106986
	* gfortran.dg/pr106986.f90: New test.

gcc/fortran/simplify.cc

@@ -5895,6 +5895,7 @@ gfc_simplify_findloc (gfc_expr *array, gfc_expr *value, gfc_expr *dim,
   bool back_val = false;
 
   if (!is_constant_array_expr (array)
+      || array->shape == NULL
       || !gfc_is_constant_expr (dim))
     return NULL;
 

gcc/testsuite/gfortran.dg/pr106986.f90

@@ -0,0 +1,8 @@
+! { dg-do compile }
+! PR fortran/106986 - ICE in simplify_findloc_nodim
+! Contributed by G.Steinmetz
+
+program p
+  integer, parameter :: a(:) = [1] ! { dg-error "deferred shape" }
+  print *, findloc (a, 1)
+end