Adjust gfortran.dg/predict-2.f90

After teaching VN to handle internal functions we now optimize
the redundant inner loop preheader check of the testcase making
the dump scanning fail because there's nothing to predict left.
The following restores the inner preheader check by making it
not redundant.

2021-10-05  Richard Biener  <rguenther@suse.de>

	* gfortran.dg/predict-2.f90: Adjust to avoid redundant
	inner loop preheader checking code.

gcc/testsuite/gfortran.dg/predict-2.f90

@@ -2,10 +2,10 @@
 ! { dg-options "-O2 -fdump-tree-profile_estimate" }
 
 subroutine test(block, array)
-integer :: i,j, block(9), array(2)
+integer :: i,j, block(9), array(4)
 
 do i = array(1), array(2), 2
-    do j = array(1), array(2), 3
+    do j = array(3), array(4), 3
        block(i) = j
     end do
 end do