RFR: 8160821: VarHandle accesses are penalized when argument conversion is required [v3]

[Viktor Klang]

On Mon, 1 Dec 2025 23:41:04 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Since access descriptor is created for each VH operation site, we can optimistically cache the adapted method handle in a site if the site operates on a constant VH.  Used a C2 IR test to verify such a setup through an inexact VarHandle invocation can be constant folded through (previously, it was blocked by `asType`)
>
> Chen Liang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Tweak VH usage in some classes

src/java.base/share/classes/java/lang/invoke/MethodHandleImpl.java line 632:

> 630:     @Hidden
> 631:     @jdk.internal.vm.annotation.IntrinsicCandidate
> 632:     static int isCompileConstant(Object obj) {

nit: an "is"-question tends to indicate a yes/no answer, but in this case it is more of a compileConstantStatus.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28585#discussion_r2580489368