Implement parsing and code generation of Objective-C string literals.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41238 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Sema/Sema.h b/Sema/Sema.h
index 0613ee5..42beb84 100644
--- a/Sema/Sema.h
+++ b/Sema/Sema.h
@@ -323,6 +323,9 @@
   /// ParseCXXBoolLiteral - Parse {true,false} literals.
   virtual ExprResult ParseCXXBoolLiteral(SourceLocation OpLoc,
                                          tok::TokenKind Kind);
+  
+  // ParseObjCStringLiteral - Parse Objective-C string literals.
+  virtual ExprResult ParseObjCStringLiteral(ExprTy *string);
 private:
   // UsualUnaryConversions - promotes integers (C99 6.3.1.1p2) and converts
   // functions and arrays to their respective pointers (C99 6.3.2.1).