[PATCH] [x32] Use ebp/esp as frame and stack pointer

[Derek Schuff]

OK, after taking a closer look, I had thought some other changes might be required but because of what we have upstream and downstream, we'll have to fix stuff on our end anyway. For the purposes of this change, can you change X86Subtarget::isTarget64BitLP64() to return false for NaCl (and then Uses64BitFramePtr would be STI.isTarget64BitLP64() || STI.isTargetNaCl64()), and then LGTM

http://reviews.llvm.org/D4617