RFR: 8309663: test fails "assert(check_alignment(result)) failed: address not aligned: 0x00000008baadbabe"

[Alex Menkov]

If virtual thread has frames in stackChunks, need to apply load barriers before processing nmethods (javaVFrame::locals() and javaVFrame::expressions() do it internally)

Testing: tier1-tier5 (still in progress);
400 runs of VThreadStackRefTest.java test on linux-x64 and linux-x64-debug with "-XX:+UseZGC -Xcomp -XX:-TieredCompilation"

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Commit messages:
 - Added load barriers

Changes: https://git.openjdk.org/jdk/pull/14460/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14460&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309663
  Stats: 5 lines in 2 files changed: 3 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14460.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14460/head:pull/14460

PR: https://git.openjdk.org/jdk/pull/14460