[PATCH] Implement variable-sized alloca instrumentation (take 2).

[Maxim Ostapenko]

I would like to ping the patch. Updated with small nits fixed. All tests passed for x86_64-unknown-linux-gnu.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7098

Files:
  lib/Transforms/Instrumentation/AddressSanitizer.cpp
  lib/asan/asan_fake_stack.cc
  lib/asan/asan_interface_internal.h
  test/Instrumentation/AddressSanitizer/instrument-dynamic-allocas.ll
  test/Instrumentation/AddressSanitizer/undecidable-dynamic-alloca-1.ll
  test/asan/TestCases/Linux/interface_symbols_linux.c
  test/asan/TestCases/alloca_loop_unpoisoning.cc
  test/asan/TestCases/alloca_vla_interact.cc
  test/asan/TestCases/vla_chrome_testcase.cc
  test/asan/TestCases/vla_condition_overflow.cc
  test/asan/TestCases/vla_loop_overfow.cc

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