Take advantage of the zero byte in StringMap when emitting dwarf stringpool entries.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144184 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index be7d18a..7015555 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1937,8 +1937,9 @@
     Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first);
 
     // Emit the string itself.
-    Asm->OutStreamer.EmitBytes(Entries[i].second->getKey(), 0/*addrspace*/);
-    Asm->OutStreamer.EmitZeros(1, 0);
+    Asm->OutStreamer.EmitBytes(StringRef(Entries[i].second->getKeyData(),
+                                         Entries[i].second->getKeyLength()+1),
+                               0/*addrspace*/);
   }
 }