Fix un-initialized error introduced by r291959.

This is uncovered when running tools/dsymutil/X86/empty_range.s.test
with ASAN. Haven't investigate yet, whether that means there is an ODR
violation in that test.

llvm-svn: 292065

llvm/tools/dsymutil/DwarfLinker.cpp

@@ -211,6 +211,8 @@ public:
                              *Lang == dwarf::DW_LANG_C_plus_plus_11 ||
                              *Lang == dwarf::DW_LANG_C_plus_plus_14 ||
                              *Lang == dwarf::DW_LANG_ObjC_plus_plus);
+    else
+      HasODR = false;
   }
 
   DWARFUnit &getOrigUnit() const { return OrigUnit; }