RFR: 8299960: Speed up test/hotspot/jtreg/compiler/c2/irTests/TestVectorizeURShiftSubword.java [v3]

[Fei Gao]

On Thu, 12 Jan 2023 08:08:20 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> This is one of the most time-consuming compiler tests.
>> On my machine, I was able to reduce it from `20 sec` to `3 sec`.
>> 
>> This is an irTest, so we basically only want to see if certain IR-nodes are present.
>> By default we do `2000` warmup iterations, this is not required in these examples, so I `setDefaultWarmup(1)`.
>
> Emanuel Peter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Oracle 2023 copyright

LGTM

-------------

Marked as reviewed by fgao (Committer).

PR: https://git.openjdk.org/jdk/pull/11942