[riscv-port] RFR: 8277877: C2 fast_unlock intrinsic on riscv has unnecessary ownership check

[Yadong Wang]

It's an optional, maybe only for debug, to check the owner of the lock in the fast_unlock intrinsic in riscv, which already applied in AArch64.

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Commit messages:
 - 8277877: C2 fast_unlock intrinsic on riscv has unnecessary ownership check

Changes: https://git.openjdk.java.net/riscv-port/pull/14/files
 Webrev: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=14&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277877
  Stats: 5 lines in 1 file changed: 1 ins; 4 del; 0 mod
  Patch: https://git.openjdk.java.net/riscv-port/pull/14.diff
  Fetch: git fetch https://git.openjdk.java.net/riscv-port pull/14/head:pull/14

PR: https://git.openjdk.java.net/riscv-port/pull/14