Build libgcc_eh with nacl-gcc for x86.
Build libgcc_eh with nacl-gcc for x86.

This solves the problem of the upper half of 64-bit registers not
being restored, and of functions which use eh_return potentially
not returning the right values in their non eh_return paths.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=1933
R=mseaborn@chromium.org

Review URL: https://codereview.chromium.org/17021002

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11551 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client