DWARF: Reset the state after parsing a line table prologue and remove an unnecessary lookup.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139859 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/DebugInfo/DWARFContext.cpp b/lib/DebugInfo/DWARFContext.cpp
index 4fc0b30..e1ac398 100644
--- a/lib/DebugInfo/DWARFContext.cpp
+++ b/lib/DebugInfo/DWARFContext.cpp
@@ -141,10 +141,8 @@
 }
 
 DILineInfo DWARFContext::getLineInfoForAddress(uint64_t address) {
-  // First, get the index for the arange.
-  uint32_t arangeIndex = getDebugAranges()->findAddress(address);
-  // From there, get the offset of the compile unit.
-  uint32_t cuOffset = getDebugAranges()->offsetAtIndex(arangeIndex);
+  // First, get the offset of the compile unit.
+  uint32_t cuOffset = getDebugAranges()->findAddress(address);
   // Retrieve the compile unit.
   DWARFCompileUnit *cu = getCompileUnitForOffset(cuOffset);
   if (!cu)