tree-optimization/106737 - remove intermediate SSA verification in autopar

The following removes intermediate SSA verification in autopar which
isn't expected to succeed after previous changes delaying (virtual)
SSA update to the end of the pass.

	PR tree-optimization/106737
	* tree-parloops.cc (transform_to_exit_first_loop_alt): Do not
	verify SSA form.

	* gcc.dg/autopar/pr106737.c: New testcase.

gcc/testsuite/gcc.dg/autopar/pr106737.c

@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-options "-O -floop-parallelize-all -ftree-parallelize-loops=2 -fno-tree-dce" } */
+
+void
+foo (int x)
+{
+  int a[2];
+  int b, c = 0;
+
+  for (b = 0; b < 2; ++b)
+    a[b] = 0;
+  for (b = 0; b < 2; ++b)
+    a[b] = 0;
+
+  while (c < 1)
+    while (x < 1)
+      ++x;
+}

gcc/tree-parloops.cc

@@ -2484,8 +2484,6 @@ transform_to_exit_first_loop_alt (class loop *loop,
   /* Recalculate dominance info.  */
   free_dominance_info (CDI_DOMINATORS);
   calculate_dominance_info (CDI_DOMINATORS);
-
-  checking_verify_ssa (true, true);
 }
 
 /* Tries to moves the exit condition of LOOP to the beginning of its header