[libclang] Introduce clang_Cursor_getSpellingNameRange().

It retrieves a source range for a piece that forms the cursors spelling name.
Most of the times there is only one range for the complete spelling but for
objc methods and objc message expressions, there are multiple pieces for each
selector identifier.

Part of rdar://11113120

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153775 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/libclang.exports b/tools/libclang/libclang.exports
index 21861fb..2fe3f1d 100644
--- a/tools/libclang/libclang.exports
+++ b/tools/libclang/libclang.exports
@@ -4,6 +4,7 @@
 clang_CXIndex_setGlobalOptions
 clang_CXXMethod_isStatic
 clang_CXXMethod_isVirtual
+clang_Cursor_getSpellingNameRange
 clang_Cursor_getTranslationUnit
 clang_Cursor_isNull
 clang_IndexAction_create