[jdk17u-dev] RFR: 8294947: Use 64bit atomics in patch_verified_entry on x86_64

[Goetz Lindenmaier]

I backport this for parity with 17.0.7-oracle.

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Commit messages:
 - Backport d0fae43e89a73e9d73b074fa12276c43ba629278

Changes: https://git.openjdk.org/jdk17u-dev/pull/1025/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1025&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294947
  Stats: 22 lines in 1 file changed: 19 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1025.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1025/head:pull/1025

PR: https://git.openjdk.org/jdk17u-dev/pull/1025