[PATCH] Implement variable-sized alloca instrumentation.

[Maxim Ostapenko]

Updated according to last review, major changes are:

1) Removed redundant new BB creation.
2) Added small fixes for tests.
3) Defined new constants on top of the AddressSanitizer.cpp.

http://reviews.llvm.org/D6055

Files:
  lib/Transforms/Instrumentation/AddressSanitizer.cpp
  lib/asan/asan_internal.h
  lib/asan/asan_report.cc
  test/Instrumentation/AddressSanitizer/instrument-dynamic-allocas.ll
  test/asan/TestCases/alloca_big_alignment.cc
  test/asan/TestCases/alloca_detect_custom_size_.cc
  test/asan/TestCases/alloca_instruments_all_paddings.cc
  test/asan/TestCases/alloca_overflow_partial.cc
  test/asan/TestCases/alloca_overflow_right.cc
  test/asan/TestCases/alloca_safe_access.cc
  test/asan/TestCases/alloca_underflow_left.cc
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