RFR: 8319900: Recursive lightweight locking: riscv64 implementation

[Gui Cao]

Implementation of recursive lightweight JDK-8319796 for linux-riscv64.

### Correctness testing:

- [x]  Run tier1-3, hotspot:tier4 tests with -XX:LockingMode=1 & -XX:LockingMode=2 on LicheePI 4A (release)
- [x]  Run tier1-3 tests with -XX:LockingMode=1 & -XX:LockingMode=2 on qemu 8.1.0 (fastdebug)

### JMH tested on LicheePI 4A:


Before (LockingMode = 2):

Benchmark                                (innerCount)  Mode  Cnt       Score      Error  Units
LockUnlock.testContendedLock                      100  avgt   12     281.603 ±    2.626  ns/op
LockUnlock.testRecursiveLockUnlock                100  avgt   12  196373.917 ± 4669.241  ns/op
LockUnlock.testRecursiveSynchronization           100  avgt   12     274.492 ±    6.049  ns/op
LockUnlock.testSerialLockUnlock                   100  avgt   12   11516.092 ±   69.964  ns/op
LockUnlock.testSimpleLockUnlock                   100  avgt   12   11490.789 ±   58.833  ns/op

After (LockingMode = 2):

Benchmark                                (innerCount)  Mode  Cnt      Score    Error  Units
LockUnlock.testContendedLock                      100  avgt   12    307.013 ±  3.259  ns/op
LockUnlock.testRecursiveLockUnlock                100  avgt   12  59047.222 ± 94.748  ns/op
LockUnlock.testRecursiveSynchronization           100  avgt   12    259.789 ±  1.698  ns/op
LockUnlock.testSerialLockUnlock                   100  avgt   12   6055.775 ± 13.518  ns/op
LockUnlock.testSimpleLockUnlock                   100  avgt   12   6090.986 ± 67.179  ns/op



Before (LockingMode = 1):

Benchmark                                (innerCount)  Mode  Cnt      Score     Error  Units
LockUnlock.testContendedLock                      100  avgt   12    286.144 ±   2.490  ns/op
LockUnlock.testRecursiveLockUnlock                100  avgt   12  68058.259 ± 286.262  ns/op
LockUnlock.testRecursiveSynchronization           100  avgt   12    263.132 ±   4.075  ns/op
LockUnlock.testSerialLockUnlock                   100  avgt   12   7521.777 ±  35.193  ns/op
LockUnlock.testSimpleLockUnlock                   100  avgt   12   7522.480 ±  26.310  ns/op

After (LockingMode = 1):

Benchmark                                (innerCount)  Mode  Cnt      Score     Error  Units
LockUnlock.testContendedLock                      100  avgt   12    289.034 ±   5.821  ns/op
LockUnlock.testRecursiveLockUnlock                100  avgt   12  68474.370 ± 495.135  ns/op
LockUnlock.testRecursiveSynchronization           100  avgt   12    261.052 ±   4.560  ns/op
LockUnlock.testSerialLockUnlock                   100  avgt   12   7513.187 ±  19.524  ns/op
LockUnlock.testSimpleLockUnlock                   100  avgt   12   7461.287 ± 118.634  ns/op

-------------

Commit messages:
 - Merge branch 'master' into JDK-8319900
 - improve code
 - Polish code comment
 - 8319900: Recursive lightweight locking: riscv64 implementation

Changes: https://git.openjdk.org/jdk/pull/17554/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17554&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319900
  Stats: 613 lines in 9 files changed: 411 ins; 114 del; 88 mod
  Patch: https://git.openjdk.org/jdk/pull/17554.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17554/head:pull/17554

PR: https://git.openjdk.org/jdk/pull/17554