hg: jdk/sandbox: 8248043: Need to eliminate excessive i2l conversions

[chris.hegarty at oracle.com]

Changeset: 00a964b6ab71
Author:    bulasevich
Date:      2020-07-06 04:44 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/00a964b6ab71

8248043: Need to eliminate excessive i2l conversions
Reviewed-by: redestad, kvn, iveresov

! src/hotspot/share/opto/subnode.cpp
! src/hotspot/share/opto/subnode.hpp
+ test/hotspot/jtreg/compiler/c2/TestSkipLongToIntCast.java
+ test/micro/org/openjdk/bench/vm/compiler/SkipIntToLongCast.java