Remove std::string uses from DebugInfo interface.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83083 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 6c5d453..ff16f22 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -1750,9 +1750,8 @@
   O.PadToColumn(MAI->getCommentColumn());
   O << MAI->getCommentString() << " SrcLine ";
   if (DLT.CompileUnit) {
-    std::string Str;
     DICompileUnit CU(DLT.CompileUnit);
-    O << CU.getFilename(Str) << " ";
+    O << CU.getFilename() << " ";
   }
   O << DLT.Line;
   if (DLT.Col != 0)