Fix register saving on i386

Alexey Borzenkov avatarAlexey Borzenkov created an issue

There's a problem on i386 similar to amd64 with regards to register saving and different compiler options. It needs to trick-save ebp and ebx since they cannot be clobbered in some configurations. Example what leads to a crash on Mac OS X 10.7:

CC="/usr/bin/gcc-4.2" LDFLAGS="-Wl,-read_only_relocs,suppress" ARCHFLAGS="-arch i386" CFLAGS="-fomit-frame-pointer -fno-pic" arch -i386 python test

Stability is more important than speed.

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