git: openjdk/jdk: 8277850: C2: optimize mask checks in counted loops

[Roland Westrelin]

Changeset: 8af3b27c
Author:    Roland Westrelin <roland at openjdk.org>
Date:      2021-12-08 16:39:24 +0000
URL:       https://git.openjdk.java.net/jdk/commit/8af3b27ce98bcb9cf0c155c98d6b9a9bc159aafe

8277850: C2: optimize mask checks in counted loops

Reviewed-by: kvn, thartmann

! src/hotspot/share/opto/mulnode.cpp
! src/hotspot/share/opto/mulnode.hpp
+ test/hotspot/jtreg/compiler/c2/irTests/TestShiftAndMask.java
! test/hotspot/jtreg/compiler/lib/ir_framework/IRNode.java