Remove unnecessary copy of constraint info.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70835 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenFunction.h b/lib/CodeGen/CodeGenFunction.h
index 04c0026..0729ae2 100644
--- a/lib/CodeGen/CodeGenFunction.h
+++ b/lib/CodeGen/CodeGenFunction.h
@@ -801,7 +801,8 @@
   void ExpandTypeToArgs(QualType Ty, RValue Src,
                         llvm::SmallVector<llvm::Value*, 16> &Args);
 
-  llvm::Value* EmitAsmInput(const AsmStmt &S, TargetInfo::ConstraintInfo Info,
+  llvm::Value* EmitAsmInput(const AsmStmt &S, 
+                            const TargetInfo::ConstraintInfo &Info,
                             const Expr *InputExpr, std::string &ConstraintStr);
 
   /// EmitCleanupBlock - emits a single cleanup block.