[PATCH] Fix name lookup within modules during template instantiation

[Richard Smith]

  Cache computation of defining module for a template for the duration of its instantiation.

Hi doug.gregor,

http://llvm-reviews.chandlerc.com/D1204

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1204?vs=2978&id=2995#toc

Files:
  test/Modules/Inputs/cxx-templates-b-impl.h
  test/Modules/Inputs/module.map
  test/Modules/Inputs/cxx-templates-a.h
  test/Modules/Inputs/cxx-templates-common.h
  test/Modules/Inputs/cxx-templates-b.h
  test/Modules/cxx-templates.cpp
  include/clang/Basic/Module.h
  include/clang/Sema/Lookup.h
  include/clang/Sema/Sema.h
  include/clang/AST/DeclBase.h
  lib/Basic/Module.cpp
  lib/Sema/SemaLookup.cpp
  lib/Sema/Sema.cpp
  lib/Sema/SemaTemplateInstantiate.cpp
  lib/Sema/SemaType.cpp
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