[Sema] Temporarily disable an incorrect fix-it.

The fix-it was pointing to the wrong location.

rdar://problem/30099581
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index 5ecafb5..8d7c257 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -13431,8 +13431,7 @@
       if (BuildAndDiagnose) {
         SourceLocation VarLoc = Var->getLocation();
         S.Diag(Loc, diag::warn_block_capture_autoreleasing);
-        S.Diag(VarLoc, diag::note_declare_parameter_autoreleasing) <<
-            FixItHint::CreateInsertion(VarLoc, "__autoreleasing");
+        S.Diag(VarLoc, diag::note_declare_parameter_autoreleasing);
         S.Diag(VarLoc, diag::note_declare_parameter_strong);
       }
     }