RFR: fix for casLockState intrinsic [v2]

[Dean Long]

> Read of to/from args needs to be 32-bit.  Also simplified masking logic.

Dean Long has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.org/loom/pull/204/files
  - new: https://git.openjdk.org/loom/pull/204/files/0192dc61..0192dc61

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=loom&pr=204&range=01
 - incr: https://webrevs.openjdk.org/?repo=loom&pr=204&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/loom/pull/204.diff
  Fetch: git fetch https://git.openjdk.org/loom.git pull/204/head:pull/204

PR: https://git.openjdk.org/loom/pull/204