Fix DIBuilder::createVariantPart after f6617d6

which ended up passing 0 for the Discriminator arg, Discriminator for
the DataLocation arg, etc.

The DICompositeType::get's new NumExtraInhabitants parameter is at the
end, and has a default value, so no change in the caller is necessary.

See comment on llvm#112590

llvm/lib/IR/DIBuilder.cpp

@@ -554,7 +554,7 @@ DIBuilder::createVariantPart(DIScope *Scope, StringRef Name, DIFile *File,
   auto *R = DICompositeType::get(
       VMContext, dwarf::DW_TAG_variant_part, Name, File, LineNumber,
       getNonCompileUnitScope(Scope), nullptr, SizeInBits, AlignInBits, 0, Flags,
-      Elements, 0, nullptr, nullptr, UniqueIdentifier, 0, Discriminator);
+      Elements, 0, nullptr, nullptr, UniqueIdentifier, Discriminator);
   trackIfUnresolved(R);
   return R;
 }