Specialize diag::warn_unused_call for the "warn_unused_result" attribute, so
it can be controlled with a distinct flag.

llvm-svn: 136941
diff --git a/clang/lib/Sema/SemaStmt.cpp b/clang/lib/Sema/SemaStmt.cpp
index 5825d6b..6b2935f 100644
--- a/clang/lib/Sema/SemaStmt.cpp
+++ b/clang/lib/Sema/SemaStmt.cpp
@@ -123,7 +123,7 @@
     // a more specific message to make it clear what is happening.
     if (const Decl *FD = CE->getCalleeDecl()) {
       if (FD->getAttr<WarnUnusedResultAttr>()) {
-        Diag(Loc, diag::warn_unused_call) << R1 << R2 << "warn_unused_result";
+        Diag(Loc, diag::warn_unused_result) << R1 << R2;
         return;
       }
       if (FD->getAttr<PureAttr>()) {
@@ -142,7 +142,7 @@
     }
     const ObjCMethodDecl *MD = ME->getMethodDecl();
     if (MD && MD->getAttr<WarnUnusedResultAttr>()) {
-      Diag(Loc, diag::warn_unused_call) << R1 << R2 << "warn_unused_result";
+      Diag(Loc, diag::warn_unused_result) << R1 << R2;
       return;
     }
   } else if (isa<ObjCPropertyRefExpr>(E)) {