[PATCH] preview patch for fixit for finding modules needing import/inclusion

[John Thompson]

  I added a BuildingModule flag to ModuleLoader so I could avoid doing the correctTypo modules import fixit or global module index rebuild when a module is being built.

  I merged the prior need import error message into a single warning.

  I hack the test/Modules tests to accomodate the new error, and to disable the modules import fixit for tests that trigger an index rebuild involving the test/Modules/module.map file, as some modules have build errors that get triggered.

  I didn't do anything with respect to the issue of not displaying error messages during a module build, leaving it for a separate fix.

  Is this ready to check in?

  Thanks.

  -John

Hi doug.gregor, rsmith,

http://llvm-reviews.chandlerc.com/D2671

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2671?vs=8146&id=8275#toc

Files:
  test/Modules/cxx-templates.cpp
  test/Modules/subframeworks.m
  test/Modules/lookup.cpp
  test/Modules/objc-categories.m
  test/Modules/auto-module-import.m
  test/Modules/undefined-type-fixit1.cpp
  test/Modules/wildcard-submodule-exports.cpp
  test/Modules/module-private.cpp
  test/Modules/decldef.m
  test/Modules/redecl-namespaces.mm
  test/Modules/normal-module-map.cpp
  test/Modules/extern_c.cpp
  test/Modules/cxx-inline-namespace.cpp
  test/Modules/template-specialization-visibility.cpp
  test/Modules/decldef.mm
  test/Modules/Inputs/undefined-type-fixit/public2sub.h
  test/Modules/Inputs/undefined-type-fixit/module.map
  test/Modules/Inputs/undefined-type-fixit/public1.h
  test/Modules/Inputs/undefined-type-fixit/public2.h
  test/Modules/cxx-linkage-cache.cpp
  test/Modules/submodules.cpp
  include/clang/Frontend/CompilerInstance.h
  include/clang/Frontend/ASTUnit.h
  include/clang/Basic/LangOptions.def
  include/clang/Basic/DiagnosticGroups.td
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Sema/Sema.h
  include/clang/Lex/ModuleLoader.h
  include/clang/Lex/HeaderSearch.h
  include/clang/Driver/Options.td
  include/clang/Serialization/ASTReader.h
  include/clang/Serialization/GlobalModuleIndex.h
  unittests/Basic/SourceManagerTest.cpp
  unittests/Lex/LexerTest.cpp
  unittests/Lex/PPCallbacksTest.cpp
  unittests/Lex/PPConditionalDirectiveRecordTest.cpp
  unittests/Lex/CMakeLists.txt
  unittests/Lex/Makefile
  lib/Frontend/CompilerInstance.cpp
  lib/Frontend/CompilerInvocation.cpp
  lib/Sema/SemaDeclObjC.cpp
  lib/Sema/SemaDecl.cpp
  lib/Sema/SemaType.cpp
  lib/Sema/SemaLookup.cpp
  lib/Lex/HeaderSearch.cpp
  lib/Serialization/GlobalModuleIndex.cpp
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