Change wording of warning about using __bridge casts in non-ARC.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150868 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseExpr.cpp b/lib/Parse/ParseExpr.cpp
index 75510ad..fada2e3 100644
--- a/lib/Parse/ParseExpr.cpp
+++ b/lib/Parse/ParseExpr.cpp
@@ -1866,7 +1866,7 @@
     StringRef BridgeCastName = Tok.getName();
     SourceLocation BridgeKeywordLoc = ConsumeToken();
     if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
-      Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_nonarc)
+      Diag(BridgeKeywordLoc, diag::warn_arc_bridge_cast_nonarc)
         << BridgeCastName
         << FixItHint::CreateReplacement(BridgeKeywordLoc, "");
     BridgeCast = false;