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/CGStmt.cpp b/lib/CodeGen/CGStmt.cpp
index eb7697d..441047e 100644
--- a/lib/CodeGen/CGStmt.cpp
+++ b/lib/CodeGen/CGStmt.cpp
@@ -726,7 +726,7 @@
 }
 
 llvm::Value* CodeGenFunction::EmitAsmInput(const AsmStmt &S,
-                                           TargetInfo::ConstraintInfo Info, 
+                                         const TargetInfo::ConstraintInfo &Info,
                                            const Expr *InputExpr,
                                            std::string &ConstraintStr) {
   llvm::Value *Arg;