[jdk11u-dev] RFR: 8321215: Incorrect x86 instruction encoding for VSIB addressing mode

[Goetz Lindenmaier]

I backport this for parity with 11.0.23-oracle.

I had to resolve due to context.

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Commit messages:
 - Backport 027b5dbb6a299e49d3dcbe67d529d6edc67f16d9

Changes: https://git.openjdk.org/jdk11u-dev/pull/2427/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2427&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/jdk11u-dev/pull/2427.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2427/head:pull/2427

PR: https://git.openjdk.org/jdk11u-dev/pull/2427