Add libclang function 'clang_isFromMainFile()' (which just wraps SourceManager::isFromMainFile()).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@104208 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/libclang.darwin.exports b/tools/libclang/libclang.darwin.exports
index 4b61bd3..59888f1 100644
--- a/tools/libclang/libclang.darwin.exports
+++ b/tools/libclang/libclang.darwin.exports
@@ -77,6 +77,7 @@
 _clang_isCursorDefinition
 _clang_isDeclaration
 _clang_isExpression
+_clang_isFromMainFile
 _clang_isInvalid
 _clang_isPreprocessing
 _clang_isReference