[PATCH] [ASan] Improved stack overflow detection for PowerPC64

[Jay Foad]

Hi kcc, samsonov, eugenis,

AsanOnSIGSEGV has some heuristics for detecting stack overflow, but
they don't cope with a PowerPC store-with-update instruction which
modifies sp and stores to the modified address in one instruction.

This patch adds some PowerPC-specific code to check for this case.

This fixes the last few cases of the stack-overflow test.

http://reviews.llvm.org/D6253

Files:
  lib/asan/asan_posix.cc
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