RFR: 8322806: Eliminate -Wparentheses warnings in aarch64 code

[Stefan Karlsson]

On Tue, 2 Jan 2024 02:49:09 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change to eliminate some -Wparentheses warnings.  This
> involved simply adding a few parentheses to make some implicit operator
> precedence explicit.
> 
> Testing: mach5 tier1
> 
> Also ran mach5 tier1 with these changes in conjunction enabling -Wparentheses
> and other changes needed to make that work.

Seems fine. FWIW, the second usage of `ret` looks redundant.

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Marked as reviewed by stefank (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/17210#pullrequestreview-1800130145