Merge pull request llvm#9962 from swiftlang/llvm/mdfield-print-to-202…

…40723

[llvm][AsmWriter] Don't skip zero-valued DwarfEnum MDField when ShouldSkipZero is not set

llvm/lib/IR/AsmWriter.cpp

@@ -1968,7 +1968,7 @@ void MDFieldPrinter::printNameTableKind(StringRef Name,
 template <class IntTy, class Stringifier>
 void MDFieldPrinter::printDwarfEnum(StringRef Name, IntTy Value,
                                     Stringifier toString, bool ShouldSkipZero) {
-  if (!Value)
+  if (ShouldSkipZero && !Value)
     return;
 
   Out << FS << Name << ": ";