testsuite: Fix gcc.target/powerpc/vsx-builtin-7.c test [PR119382]

testsuite: Fix gcc.target/powerpc/vsx-builtin-7.c test [PR119382]

The test vsx-builtin-7.c failed on powerpc64le-linux due to Identical
Code Folding (ICF) merging the functions insert_di_0_v2 and insert_di_0.
This behavior was introduced by commit r15-7961-gdc47161c1f32c3, which
enhanced alias analysis in ao_compare::compare_ao_refs, enabling the
compiler to identify and optimize structurally identical functions. As a
result, the compiler replaced insert_di_0_v2 with a tail call to
insert_di_0, altering the expected test behavior.

This patch adds -fno-ipa-icf to the test's dg-options to disable ICF,
avoiding function merging and ensuring the test executes correctly.

2025-06-24  Jeevitha Palanisamy  <jeevitha@linux.ibm.com>

gcc/testsuite/
	PR testsuite/119382
	* gcc.target/powerpc/vsx-builtin-7.c: Add '-fno-ipa-icf' to dg-options.

(cherry picked from commit a1fb757342058111fddcdc5ca2f866c61e87c9b8)