[PATCH] Insert poisoned paddings between fields in C++ classes.

[Kostya Serebryany]

Addressed most of the comments in the review, added tests,
moved the check for validity of the instrumentation to RecordDecl::MayInsertExtraPadding,
added a remark flag -Rsanitize-address.

PTAL

This CL still has one FIXME pending Alexey's changes for -fsanitize-blacklist flag.

http://reviews.llvm.org/D5687

Files:
  include/clang/AST/Decl.h
  include/clang/Basic/DiagnosticFrontendKinds.td
  include/clang/Basic/DiagnosticGroups.td
  lib/AST/Decl.cpp
  lib/AST/RecordLayoutBuilder.cpp
  lib/CodeGen/CGClass.cpp
  lib/CodeGen/CodeGenFunction.h
  test/CodeGen/sanitize-address-field-padding.cpp
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