[PATCH] [ASan] Really fix zero_page_pc test for PowerPC

[Jay Foad]

Hi kcc, glider, samsonov,

As a follow-up to D6167, this patch fixes the test to account for
another difference between PowerPC and x86 systems.

On x86 if you branch to an invalid address, you get a SIGSEGV with PC
set to the invalid address (and si_addr in the siginfo struct also set
to the same address).

On PowerPC, you get a SIGSEGV with PC pointing at the branch
instruction, but si_addr set to the invalid address.

You can see this difference if you run the test case under gdb.

http://reviews.llvm.org/D6226

Files:
  test/asan/TestCases/zero_page_pc.cc
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