Add const qualifiers to TargetLoweringObjectFile usage.

llvm-svn: 101640
diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index cb2187d..daf0025 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -93,7 +93,7 @@
   return MF->getFunctionNumber();
 }
 
-TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
+const TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
   return TM.getTargetLowering()->getObjFileLowering();
 }