[DWARF] DWARFDebugLoc::dumpRawEntry - remove dead stores. NFCI.

Don't bother zeroing local (unused) variables just before returning.

Fixes clang static analyzer warning.

lib/DebugInfo/DWARF/DWARFDebugLoc.cpp

@@ -260,7 +260,6 @@ void DWARFDebugLoc::dumpRawEntry(const DWARFLocationEntry &Entry,
     Value1 = Entry.Value1;
     break;
   case dwarf::DW_LLE_end_of_list:
-    Value0 = Value1 = 0;
     return;
   default:
     llvm_unreachable("Not possible in DWARF4!");