[PATCH] Consolidate several functions for checking the std namespace into one function in Decl and one function in DeclContext

[Richard Trieu]

Create Decl::isInStdNamespace() and DeclContext::isStdNamespace() for namespace checking.  This will replace six implementations of std namespace checkers.

The std namespace checker in the Itanium mangler has been left since it performs additional checks with its checker.

http://reviews.llvm.org/D3333

Files:
  include/clang/AST/DeclBase.h
  lib/Analysis/Consumed.cpp
  lib/Sema/SemaExceptionSpec.cpp
  lib/Sema/SemaTemplateInstantiateDecl.cpp
  lib/AST/Decl.cpp
  lib/AST/DeclBase.cpp
  lib/StaticAnalyzer/Core/ExprEngineCallAndReturn.cpp
  lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
  lib/StaticAnalyzer/Checkers/LLVMConventionsChecker.cpp
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