am 6a8c3164: am e35cba9a: am a97798af: Merge "Create an UnwindMapLocal object."

* commit '6a8c316438032c72ffdd2988cc1eb2717f477254':
  Create an UnwindMapLocal object.

Cr-Mirrored-From: https://chromium.googlesource.com/aosp/platform/system/core
Cr-Mirrored-Commit: 7962e4acc735c7083ea060661b847e818d0a79a7

• Android.mk[diff]
• BacktraceImpl.cpp[diff]
• BacktraceImpl.h[diff]
• BacktraceLog.h[Added - diff]
• BacktraceThread.cpp[diff]
• Corkscrew.cpp[diff]
• GetPss.cpp[Added - diff]
• GetPss.h[Added - diff]
• UnwindCurrent.cpp[diff]
• UnwindMap.cpp[diff]
• UnwindMap.h[diff]
• UnwindPtrace.cpp[diff]
• backtrace_test.cpp[diff]