DebugInfo: Fix rangesBaseAddress DICompileUnit bitcode serialization/deserialization

Follow-up to r346788 review feedback from Adrian Prantl.

llvm/lib/Bitcode/Writer/BitcodeWriter.cpp

@@ -1661,6 +1661,7 @@ void ModuleBitcodeWriter::writeDICompileUnit(const DICompileUnit *N,
   Record.push_back(N->getSplitDebugInlining());
   Record.push_back(N->getDebugInfoForProfiling());
   Record.push_back((unsigned)N->getNameTableKind());
+  Record.push_back(N->getRangesBaseAddress());
 
   Stream.EmitRecord(bitc::METADATA_COMPILE_UNIT, Record, Abbrev);
   Record.clear();