[lilliput-jdk21u:lilliput] RFR: 8357068: Add JVMCIUseFastLocking back and set it according to LockingMode

[Cesar Soares Lucas]

Add the `JVMCIUseFastLocking` flag back as per description in the linked JBS issue.
Tested on Linux x64 with Graal unittests and JTREG tier 1-3 and TCK.

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Commit messages:
 - Add JVMCIUseFastLocking back

Changes: https://git.openjdk.org/lilliput-jdk21u/pull/38/files
  Webrev: https://webrevs.openjdk.org/?repo=lilliput-jdk21u&pr=38&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357068
  Stats: 5 lines in 3 files changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/lilliput-jdk21u/pull/38.diff
  Fetch: git fetch https://git.openjdk.org/lilliput-jdk21u.git pull/38/head:pull/38

PR: https://git.openjdk.org/lilliput-jdk21u/pull/38