testsuite: unxfail ira-shrinkwrap-prep-[12].c for x86_64 [PR117706]

testsuite: unxfail ira-shrinkwrap-prep-[12].c for x86_64 [PR117706]

When late combine was enabled for x86_64 (r15-1735-ge62ea4fb8ffcab),
these 2 testcases start to xpass in a similar fashion as when late
combine was added and the testcase was updated for aarch64 not to
xfail them there.

Pushed as obvious after a test to make sure the testcase no longer xpass.

	PR testsuite/117706
gcc/testsuite/ChangeLog:

	* gcc.dg/ira-shrinkwrap-prep-1.c: Unxfail for i?68-*-* and x86_64-*-*.
	* gcc.dg/ira-shrinkwrap-prep-2.c: Likewise.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>