RFR: 8357626: RISCV: Tighten up template interpreter method entry code [v3]

[Anjian Wen]

> do the same thing as x86/AArch64 but for RISCV
> [JDK-8352415](https://bugs.openjdk.org/browse/JDK-8352415) 
> [JDK-8356949](https://bugs.openjdk.org/browse/JDK-8356949)

Anjian Wen has updated the pull request incrementally with one additional commit since the last revision:

  add comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25412/files
  - new: https://git.openjdk.org/jdk/pull/25412/files/4fd3d6b5..79994998

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25412&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25412&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25412.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25412/head:pull/25412

PR: https://git.openjdk.org/jdk/pull/25412