diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index c48cab7..73a0920 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1187,7 +1187,7 @@
 }
 
 /// createMemberDIE - Create new member DIE.
-DIE *DwarfDebug::createMemberDIE(const DIDerivedType &DT) {
+DIE *DwarfDebug::createMemberDIE(DIDerivedType DT) {
   DIE *MemberDie = new DIE(DT.getTag());
   StringRef Name = DT.getName();
   if (!Name.empty())
@@ -1264,7 +1264,7 @@
 }
 
 /// createSubprogramDIE - Create new DIE using SP.
-DIE *DwarfDebug::createSubprogramDIE(const DISubprogram &SP, bool MakeDecl) {
+DIE *DwarfDebug::createSubprogramDIE(DISubprogram SP, bool MakeDecl) {
   CompileUnit *SPCU = getCompileUnit(SP);
   DIE *SPDie = SPCU->getDIE(SP);
   if (SPDie)