[PATCH] [WIP] Use dynamic alloca for stack variables in ASan.

[Alexey Samsonov]

  - Remove the extra argument of __asan_stack_malloc function:
    instead, calculate SP inside ASan runtime.
  - Compare FakeStack to null to check if we need to call __asan_stack_free.
  - Update the test cases accordingly.
  - Address review comment.

http://reviews.llvm.org/D6465

Files:
  lib/Transforms/Instrumentation/AddressSanitizer.cpp
  test/Instrumentation/AddressSanitizer/stack_dynamic_alloca.ll
  test/Instrumentation/AddressSanitizer/stack_layout.ll
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