6920977: G1: guarantee(k == probe->klass(),"klass should be in dictionary") fails Summary: the guarantee is too strict and the test will fail (incorrectly) if the class is not in the system dictionary but in the placeholders. Reviewed-by: acorn, phh

Merge

6926048: Improve Zero performance Summary: Make Zero figure out result types in a similar way to C++ interpreter implementation. Reviewed-by: kvn Contributed-by: gbenson@redhat.com