hg: jdk/sandbox: 8239142: C2's UseUniqueSubclasses optimization is broken for array accesses

[chris.hegarty at oracle.com]

Changeset: 83949f956490
Author:    thartmann
Date:      2020-02-18 08:28 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/83949f956490

8239142: C2's UseUniqueSubclasses optimization is broken for array accesses
Summary: Avoid resetting the elemtype for array accesses.
Reviewed-by: vlivanov, eosterlund

! src/hotspot/share/opto/parse.hpp
! src/hotspot/share/opto/parse2.cpp