RFR: 8276215: Intrinsics matchers should handle native method flags better

[David Holmes]

On Mon, 1 Nov 2021 12:22:37 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Found this while working on JDK-8276096. It seems when the actual method is native, `F_R` (regular) intrinsic definition still matches. I believe that happens because flag matchers check for native flags only optionally. It would be better to implement this more consistently. This requires a few simple adjustments to current intrinsics definitions. #6184 handled a larger `StrictMath` oddity.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `tier1`
>  - [x] Linux x86_64 fastdebug `tier2`
>  - [x] Linux x86_64 fastdebug `applications/ctw/modules` (which has a nice side-effect of touching a lot of JDK methods)

Okay - if @vnkozlov  is okay with this then I am okay with it.

Thanks,
David

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Marked as reviewed by dholmes (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/6187