Index: llvm-convert.cpp
===================================================================
--- llvm-convert.cpp	(revision 122670)
+++ llvm-convert.cpp	(working copy)
@@ -74,7 +74,7 @@
 /// "gimple_formal_tmp_var".
 static bool isGCC_SSA_Temporary(tree decl) {
   return TREE_CODE(decl) == VAR_DECL &&
-         DECL_GIMPLE_FORMAL_TEMP_P(decl) &&
+         DECL_GIMPLE_FORMAL_TEMP_P(decl) && !TREE_ADDRESSABLE(decl) &&
          !isAggregateType(TREE_TYPE(decl));
 }
 
Index: convert.c
===================================================================
--- convert.c	(revision 122671)
+++ convert.c	(working copy)
@@ -750,7 +750,8 @@
 	  return convert (type, build_compound_literal_vector (TREE_TYPE (expr), expr));
       /* APPLE LOCAL end AltiVec */
 
-      return build1 (NOP_EXPR, type, expr);
+      /* APPLE LOCAL mainline 4253848 */
+      return build1 (VIEW_CONVERT_EXPR, type, expr);
 
     default:
       error ("can't convert value to a vector");