git: openjdk/jdk: 8278114: New addnode ideal optimization: converting "x + x" into "x << 1"

[Vladimir Kozlov]

Changeset: f3263053
Author:    Zhiqiang Zang <zhiqiang.zang at utexas.edu>
Committer: Vladimir Kozlov <kvn at openjdk.org>
Date:      2022-01-05 00:38:59 +0000
URL:       https://git.openjdk.java.net/jdk/commit/f3263053963451637258f9d318e7b93b79fcce54

8278114: New addnode ideal optimization: converting "x + x" into "x << 1"

Reviewed-by: kvn, redestad

! src/hotspot/share/opto/mulnode.cpp
+ test/hotspot/jtreg/compiler/c2/irTests/TestIRLShiftIdeal_XPlusX_LShiftC.java
! test/hotspot/jtreg/compiler/lib/ir_framework/IRNode.java
+ test/micro/org/openjdk/bench/vm/compiler/LShiftIdeal_XPlusX_LShiftC.java