RFR: 8299960: Speed up test/hotspot/jtreg/compiler/c2/irTests/TestVectorizeURShiftSubword.java [v2]

[Fei Gao]

On Wed, 11 Jan 2023 12:26:50 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:
> 
>   Review suggestion

Marked as reviewed by fgao (Committer).

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