[PATCH] [PowerPC]Adapt fast stack unwinding to work for Power.

[Bill Seurer]

This is a reworking of the fast unwind changes for power.  There is now no popping of "extra" stack frames.

10 test cases that check for specific stack locations had to be adjusted to allow for an extra frame.


http://reviews.llvm.org/D9259

Files:
  lib/sanitizer_common/sanitizer_stacktrace.cc
  lib/sanitizer_common/sanitizer_stacktrace.h
  test/asan/TestCases/Linux/malloc_delete_mismatch.cc
  test/asan/TestCases/Linux/stack-trace-dlclose.cc
  test/asan/TestCases/debug_stacks.cc
  test/asan/TestCases/double-free.cc
  test/asan/TestCases/heap-overflow.cc
  test/asan/TestCases/large_func_test.cc
  test/asan/TestCases/strncpy-overflow.cc
  test/asan/TestCases/use-after-delete.cc
  test/asan/TestCases/use-after-free-right.cc
  test/asan/TestCases/use-after-free.cc

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