[jdk11u-dev] RFR: 8294947: Use 64bit atomics in patch_verified_entry on x86_64

[Goetz Lindenmaier]

I backport this for parity with 11.0.19-oracle.

I had to swap arguments in Atomic::store().

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Commit messages:
 - Backport d0fae43e89a73e9d73b074fa12276c43ba629278

Changes: https://git.openjdk.org/jdk11u-dev/pull/1654/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1654&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/jdk11u-dev/pull/1654.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1654/head:pull/1654

PR: https://git.openjdk.org/jdk11u-dev/pull/1654