RFR: 8288303: C1: Miscompilation due to broken Class.getModifiers intrinsic

[Igor Veresov]

On Mon, 13 Jun 2022 13:21:17 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Looks like another instance when compilicated control flow in C1 LIR intrinsic confuses the C1 regalloc into miscompiling. Reliably reproduces on selected JFR tests in selected configurations, and I was unable to reproduce it in smaller test.
> 
> Additional testing:
>  - [x] JFR reproducers now pass
>  - [ ] Linux x86_64 fastdebug `tier1`
>  - [ ] Linux x86_32 fastdebug `tier1`
>  - [ ] Linux x86_64 fastdebug `tier2`
>  - [ ] Linux x86_32 fastdebug `tier2`

Marked as reviewed by iveresov (Reviewer).

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PR: https://git.openjdk.org/jdk19/pull/8