Silence gcc warnings.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@146847 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index 552d0e7..bc1e0a2 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -9262,7 +9262,8 @@
 
   if (!Folded || !AllowFold) {
     Diag(E->getSourceRange().getBegin(),
-         DiagID ? DiagID : diag::err_expr_not_ice) << E->getSourceRange();
+         DiagID ? DiagID : unsigned(diag::err_expr_not_ice))
+      << E->getSourceRange();
 
     // We only show the notes if they're not the usual "invalid subexpression"
     // or if they are actually in a subexpression.