git: openjdk/jdk17: 8268371: C2: assert(_gvn.type(obj)->higher_equal(tjp)) failed: cast_up is no longer needed

[Vladimir Ivanov]

Changeset: 9130b8a9
Author:    Vladimir Ivanov <vlivanov at openjdk.org>
Date:      2021-06-17 21:25:46 +0000
URL:       https://git.openjdk.java.net/jdk17/commit/9130b8a9d7ebd943108f01d41ed777e080f34c4d

8268371: C2: assert(_gvn.type(obj)->higher_equal(tjp)) failed: cast_up is no longer needed

Reviewed-by: roland, kvn

! src/hotspot/share/opto/graphKit.cpp
+ test/hotspot/jtreg/compiler/c2/UpcastTest.java