[PATCH] [asan] rewrite asan's stack frame layout

[Kostya Serebryany]

  Change the layout so that the frame size is multiple of MinHeaderSize.
  Otherwise we generate too many small stores to poison the tail of shadow.

Hi samsonov, dvyukov,

http://llvm-reviews.chandlerc.com/D2324

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2324?vs=5943&id=5944#toc

Files:
  unittests/Transforms/Utils/ASanStackFrameLayoutTest.cpp
  unittests/Transforms/Utils/CMakeLists.txt
  lib/Transforms/Utils/CMakeLists.txt
  lib/Transforms/Utils/ASanStackFrameLayout.cpp
  lib/Transforms/Instrumentation/AddressSanitizer.cpp
  test/Instrumentation/AddressSanitizer/stack_layout.ll
  test/Instrumentation/AddressSanitizer/basic.ll
  include/llvm/Transforms/Utils/ASanStackFrameLayout.h
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