RFR: 8283257: x86: Clean up invocation/branch counter updates code

[Aleksey Shipilev]

On Wed, 16 Mar 2022 12:07:55 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> I looked briefly at optimizing `InterpreterMacroAssembler::increment_mask_and_jump` a bit, but it looks that current code is the best we can do. This improvement does a few related cleanups without semantic changes. 
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `tier1`
>  - [x] Eyeballing interpreter generated code

Thanks for reviews!

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PR: https://git.openjdk.java.net/jdk/pull/7838