[jdk21u-dev] RFR: 8332724: x86 MacroAssembler may over-align code

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

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Commit messages:
 - Backport 08d51003d142e89b9d2f66187a4ea50e12b94fbb

Changes: https://git.openjdk.org/jdk21u-dev/pull/975/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=975&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332724
  Stats: 9 lines in 4 files changed: 0 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/975.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/975/head:pull/975

PR: https://git.openjdk.org/jdk21u-dev/pull/975