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

[Kostya Serebryany]

  Address more Alexey's comments.
  This includes actually allowing stack var alignment > 32
  Also, check that the alloca size is non-zero
  (found a case in 403.gcc where alloca is called with zero)

Hi samsonov, dvyukov,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2324?vs=5931&id=5943#toc

Files:
  test/Instrumentation/AddressSanitizer/stack_layout.ll
  test/Instrumentation/AddressSanitizer/basic.ll
  include/llvm/Transforms/Utils/ASanStackFrameLayout.h
  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
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