cp_compat_x_tst.o-cp_compat_y_tst.o testcase

[Revital1 Eres]

Hello,

While testing a patch on current trunk (r 125640) I've noticed that g++'s
cp_compat_x_tst.o-cp_compat_y_tst testcase fails with unexpected failure
on x86_64 with the vanilla version but passes OK with the patched version
(-O2).  On ppc64 and i486 the test passes both with the vanilla and the
patched version.

 -FAIL: tmpdir-g++.dg-struct-layout-1/t026
cp_compat_x_tst.o-cp_compat_y_tst.o execute

I appreciate any clue regarding the reason this testcase fails (with
Segmentation fault) on current mainline on x86_64; this could help me
understand why the patch I'm working on caused it to pass.

Thanks,
Revital