RFR: 8295009: RISC-V: Interpreter intrinsify Thread.currentThread()

[Fei Yang]

On Fri, 14 Oct 2022 02:32:28 GMT, Yadong Wang <yadongwang at openjdk.org> wrote:

> Calling intrinsic version of Thread.currentThread() in interpreter is ~30% faster on the Unmatched board:
> Before:
> Benchmark Mode Cnt Score Error Units
> MyBenchmark.testCurrentThread avgt 5 4665.765 ± 212.906 ns/op
> After:
> Benchmark Mode Cnt Score Error Units
> MyBenchmark.testCurrentThread avgt 5 3381.415 ± 223.005 ns/op
> 
> Tier1 and jdk_loom have been tested on unmatched.

LGTM.

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Marked as reviewed by fyang (Reviewer).

PR: https://git.openjdk.org/jdk/pull/10709