RFR: 8311964 : Some jtreg tests failing on x86 with error 'unrecognized VM options' (C2 flags)

[Dhamoder Nalla]

On Wed, 19 Jul 2023 23:19:28 GMT, nitinsingh130519 <duke at openjdk.org> wrote:

> This commit addresses the issue of failing jtreg tests on the x86 platform. The tests were failing due to unrecognized VM options 'LoopUnswitching', 'OptimizeFill' and 'StressCCP' which are not available in x86 binary. 
> 
> Following tests were affected: 
> 
> 1. TestInfiniteLoopWithUnmergedBackedgesMain.java - Affected by 'LoopUnswitching'
> 2. TestBackedgeLoadArrayFillMain.java - Affected by 'OptimizeFill'
> 3. TestRangeCheckCmpUOverflowVsSub.java - Affected by 'StressCCP'
> 
> Changes have been made to these tests to avoid the use of these flags when testing on x86. 
> 
> These changes maintain the integrity of the tests while ensuring compatibility across different platforms.
> 
> Related commits: 
> 
> - [ee63f83ed705c9cd3c49316fc4936668744f415d](https://github.com/microsoft/openjdk-jdk17u/commit/ee63f83ed705c9cd3c49316fc4936668744f415d#diff-ac9e408e8f32ed8c6260b005b8c386bc7a0a8738a8b8d2fe91c82b66f9f6ab7e)
> - [d21597aec91bbd41960923385f6a1feb31f14a0c](https://github.com/microsoft/openjdk-jdk17u/commit/d21597aec91bbd41960923385f6a1feb31f14a0c)
> - [e6c27925d23fe283a23c6adbe263658909c3739d](https://github.com/microsoft/openjdk-jdk17u/commit/e6c27925d23fe283a23c6adbe263658909c3739d#diff-36a07bd10ab86c032882232a1d18b96fb6a399c01dc05739c24ea12e9abc2d55)

Marked as reviewed by dhanalla (Author).

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PR Review: https://git.openjdk.org/jdk/pull/14942#pullrequestreview-1540220930