RFR: Merge valhalla:master

[Dan Smith]

Merge from jdk tag 'jdk-16+25'.

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Commit messages:
 - Merge jdk tag 'jdk-16+25' into jep390-merge/jdk-16+25
 - 8255936: "parsing found no loops but there are some" assertion failure with Shenandoah
 - 8256461: AbstractFileSystemProvider.getSunPathForSocketCall for empty Path returns '.'
 - 8253081: G1 fails on stale objects in archived module graph in Open Archive regions
 - 8255368: Math.exp() gives wrong result for large values on x86 32-bit platforms
 - 8256476: Assert in vmIntrinsics::flags_for with -XX:+Verbose
 - 8256435: [TESTBUG] java/foreign/TestHandshake.java fails with direct buffer memory OOM
 - 8255448: Fastdebug JVM crashes with Vector API when PrintAssembly is turned on
 - 8134630: make code and comments consistent for stack lock optimization
 - 8256484: ZGC: Rename ZRelocationSetSelector::register_garbage_page()
 - ... and 73 more: https://git.openjdk.java.net/valhalla/compare/eb31a05a...07c20aaf

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.java.net/valhalla/pull/275/files
  Stats: 20691 lines in 466 files changed: 12836 ins; 5156 del; 2699 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/275.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/275/head:pull/275

PR: https://git.openjdk.java.net/valhalla/pull/275