RFR: 8278793: Interpreter(x64) intrinsify Thread.currentThread()

[Robbin Ehn]

On Tue, 14 Dec 2021 15:08:54 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> Please consider this enhancement.
> This makes Thread.currentThread() eight times faster on my box when running in interpreter.
> 
> Passes t1-t4
> 
> As suggested I added a related fix to Shenandoah.
> Shenandoah LB was using InterpreterMacroAssembler version of call_VM_leaf_base (it's virtual).
> The interpreter version adds a check on last_sp, since the intrinsic is not setting up a new frame, this check is faulty.
> Other GC seems to always use the base version, so let's use the base version in Shenandoah also.
> No issues found when locally running gc/shenandoah.

@rkennke can you please review this, thanks.

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PR: https://git.openjdk.java.net/jdk/pull/6833