[PATCH] Implement variable-sized alloca instrumentation.

[Maxim Ostapenko]

Updated according to Konstantin's notes.

http://reviews.llvm.org/D6055

Files:
  lib/Transforms/Instrumentation/AddressSanitizer.cpp
  lib/asan/asan_fake_stack.cc
  lib/asan/asan_interface_internal.h
  lib/asan/asan_internal.h
  lib/asan/asan_report.cc
  test/asan/TestCases/Linux/interface_symbols_linux.c
  test/asan/TestCases/alloca_big_alignment.cc
  test/asan/TestCases/alloca_overflow_partial.cc
  test/asan/TestCases/alloca_overflow_right.cc
  test/asan/TestCases/alloca_underflow_left.cc
  test/asan/TestCases/alloca_unpoison_stack.cc
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