ValueTypes: Fix and enable testDefaultValueWithNonValueType in ValueTypeTests

[OussamaSaoudi]

testDefaultValueWithNonValueType has been disabled in PR #11560 to allow hotspot to run ValueTypeTests. The test is disabled because the change performed to make it work with hotspot has made it to longer work with OpenJ9.

When makeValueTypeDefaultValue is called in the ValueTypeGenerator, it now passes the classname as either an L-type or a Q-type to defaultvalue, instead of always a Q-type.

mv.visitTypeInsn(DEFAULTVALUE, getSigFromSimpleName(valueName, isRef));
instead of
mv.visitTypeInsn(DEFAULTVALUE, getSigFromSimpleName(valueName, false));

This results in a java.lang.NoClassDefFoundError in OpenJ9.

[OussamaSaoudi]

@tajila

[github-actions]

Issue Number: 12197
Status: Closed
Actual Components: comp:vm, project:valhalla
Actual Assignees: No one :(
PR Assignees: theresa-m