Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/DebugInfo/DWARF/DWARFDebugPubTable.h b/linux-x64/clang/include/llvm/DebugInfo/DWARF/DWARFDebugPubTable.h
index 761871d..cae4804 100644
--- a/linux-x64/clang/include/llvm/DebugInfo/DWARF/DWARFDebugPubTable.h
+++ b/linux-x64/clang/include/llvm/DebugInfo/DWARF/DWARFDebugPubTable.h
@@ -32,7 +32,7 @@
 
     /// The name of the object as given by the DW_AT_name attribute of the
     /// referenced DIE.
-    const char *Name;
+    StringRef Name;
   };
 
   /// Each table consists of sets of variable length entries. Each set describes