RFR: 8322805: Eliminate -Wparentheses warnings in x86 code

[Kim Barrett]

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.

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Commit messages:
 - fix -Wparentheses warnings in x86 code

Changes: https://git.openjdk.org/jdk/pull/17211/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17211&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322805
  Stats: 17 lines in 6 files changed: 0 ins; 0 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/17211.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17211/head:pull/17211

PR: https://git.openjdk.org/jdk/pull/17211