- Extend clang_createIndex() to support PCH and diagnostic 'filtering'. This seems cleaner to me without sacrificing much flexibility.

- Remove clang_wantOnlyLocalDeclarations().

- Remove 'displayDiagnostics' arguments to clang_createTranslationUnitFromSourceFile() and clang_createTranslationUnit().

- Have clang_createTranslationUnitFromSourceFile() strip the '-o <outfile>' command line arguments if they exist. Document this semantic in the header. Also verify we have a valid ASTUnit before telling it to 'unlinkTemporaryFile()'.

llvm-svn: 84634