[PATCH] [ASan] Fix zero_page_pc test for PowerPC

[Jay Foad]

Hi kcc, samsonov, willschm,

In the Power architecture, all branch instructions ignore the 2 least
significant bits of the target address. Consequently if you branch to an
invalid address, the address reported along with the SIGSEGV will have
been rounded down to a multiple of 4. Tweak this test accordingly.

http://reviews.llvm.org/D6167

Files:
  test/asan/TestCases/zero_page_pc.cc
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