RFR: 8357434: x86: Simplify Interpreter::profile_taken_branch

[Aleksey Shipilev]

On Wed, 21 May 2025 08:23:14 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Noticed that `Interpreter::profile_taken_branch` has the same `sbbptr` pattern we have eliminated with [JDK-8356946](https://bugs.openjdk.org/browse/JDK-8356946). The same logic applies here: the counter is 64-bit, never practically overflows, and no other code cares about it.
> 
> Also tidied up some comments around it.
> 
> Additional testing;
>  - [x] Linux x86_64 server fastdebug, `tier1 tier2`

Friendly reminder. I think this one is simple enough :)

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PR Comment: https://git.openjdk.org/jdk/pull/25343#issuecomment-2909050969