[riscv-port] RFR: 8277430: riscv: Refactor interpreter native wrappers [v2]

[Yadong Wang]

> A similar refactor similar to https://bugs.openjdk.java.net/browse/JDK-8261071, to make the code more clean and open for extension. 
> Hotspot and jdk tier1 test passed on unmatched boards. All JTreg tests were tested on qemu without new failures.

Yadong Wang has updated the pull request incrementally with one additional commit since the last revision:

  8277430: riscv: Refactor interpreter native wrappers(2)

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Changes:
  - all: https://git.openjdk.java.net/riscv-port/pull/12/files
  - new: https://git.openjdk.java.net/riscv-port/pull/12/files/d6d4c6fd..b0e28c80

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=12&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=12&range=00-01

  Stats: 11 lines in 1 file changed: 0 ins; 2 del; 9 mod
  Patch: https://git.openjdk.java.net/riscv-port/pull/12.diff
  Fetch: git fetch https://git.openjdk.java.net/riscv-port pull/12/head:pull/12

PR: https://git.openjdk.java.net/riscv-port/pull/12