[PATCH] Variable templates w/ partial support for static data members

[Larisse Voufo]

  Updated test cases, showing variable templates working even when C++1y is not enabled. appropriate warnings are generated, also indicating feature compatibility.

  Of all the test cases requested in previous review, the following  constitute the main remaining ones:
  * Tests for PCH (serialization/deserialization)
  * Tests for name mangling of variable templates, and IR generation generally (for instance, implicit internal linkage of variable template that instantiates to a const-qualified type).

  All other tests cases will be updated as the feature is completed.

Hi rsmith,

http://llvm-reviews.chandlerc.com/D1067

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1067?vs=3186&id=3188#toc

Files:
  include/clang/AST/ASTContext.h
  include/clang/AST/ASTMutationListener.h
  include/clang/AST/Decl.h
  include/clang/AST/DeclTemplate.h
  include/clang/AST/RecursiveASTVisitor.h
  include/clang/Basic/DeclNodes.td
  include/clang/Basic/DiagnosticParseKinds.td
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Basic/TemplateKinds.h
  include/clang/Sema/Sema.h
  include/clang/Sema/Template.h
  include/clang/Serialization/ASTBitCodes.h
  include/clang/Serialization/ASTWriter.h
  lib/AST/ASTContext.cpp
  lib/AST/ASTImporter.cpp
  lib/AST/Decl.cpp
  lib/AST/DeclBase.cpp
  lib/AST/DeclTemplate.cpp
  lib/AST/ItaniumMangle.cpp
  lib/CodeGen/CGDecl.cpp
  lib/CodeGen/CodeGenModule.cpp
  lib/Frontend/MultiplexConsumer.cpp
  lib/Parse/ParseCXXInlineMethods.cpp
  lib/Parse/ParseDecl.cpp
  lib/Parse/ParseDeclCXX.cpp
  lib/Parse/ParseExprCXX.cpp
  lib/Parse/ParseTemplate.cpp
  lib/Parse/Parser.cpp
  lib/Sema/SemaDecl.cpp
  lib/Sema/SemaDeclCXX.cpp
  lib/Sema/SemaExpr.cpp
  lib/Sema/SemaTemplate.cpp
  lib/Sema/SemaTemplateDeduction.cpp
  lib/Sema/SemaTemplateInstantiate.cpp
  lib/Sema/SemaTemplateInstantiateDecl.cpp
  lib/Serialization/ASTCommon.cpp
  lib/Serialization/ASTReaderDecl.cpp
  lib/Serialization/ASTWriter.cpp
  lib/Serialization/ASTWriterDecl.cpp
  test/CXX/temp/temp.decls/temp.class/temp.static/p1.cpp
  test/CXX/temp/temp.spec/cxx1y-variable-template-no-body.cpp
  test/CXX/temp/temp.spec/temp.expl.spec/examples.cpp
  test/SemaCXX/conversion-function.cpp
  test/SemaCXX/cxx1y-variable-templates_in_class.cpp
  test/SemaCXX/cxx1y-variable-templates_top_level.cpp
  test/SemaCXX/for-range-examples.cpp
  test/SemaCXX/unknown-type-name.cpp
  test/SemaTemplate/class-template-decl.cpp
  tools/libclang/CIndex.cpp
  tools/libclang/RecursiveASTVisitor.h
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