clear new map and initialize new variable


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175578 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCContext.cpp b/lib/MC/MCContext.cpp
index a074003..1a7df60 100644
--- a/lib/MC/MCContext.cpp
+++ b/lib/MC/MCContext.cpp
@@ -83,6 +83,8 @@
   DwarfDebugFlags = StringRef();
   MCLineSections.clear();
   MCLineSectionOrder.clear();
+  DwarfCompileUnitID = 0;
+  MCLineTableSymbols.clear();
   CurrentDwarfLoc = MCDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0);
 
   // If we have the MachO uniquing map, free it.