[jdk21u] RFR: 8321215: Incorrect x86 instruction encoding for VSIB addressing mode

[Sandhya Viswanathan]

8321215: Incorrect x86 instruction encoding for VSIB addressing mode

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Commit messages:
 - Backport 027b5dbb6a299e49d3dcbe67d529d6edc67f16d9

Changes: https://git.openjdk.org/jdk21u/pull/418/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=418&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321215
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u/pull/418.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/418/head:pull/418

PR: https://git.openjdk.org/jdk21u/pull/418