[riscv-port-jdk17u:riscv-port] RFR: 8293524: RISC-V: Use macro-assembler functions as appropriate

[Dingli Zhang]

Please review this backport to riscv-port-jdk17u.
Backport of [JDK-8293524](https://bugs.openjdk.org/browse/JDK-8293524).
The original patch cannot be directly applied because jdk17u has no [JDK-8276901](https://bugs.openjdk.org/browse/JDK-8276901) and already had [JDK-8295396](https://bugs.openjdk.org/browse/JDK-8295396), [JDK-8295110](https://bugs.openjdk.org/browse/JDK-8295110) and [JDK-8294187](https://bugs.openjdk.org/browse/JDK-8294187).

Testing:
- Tier1-3 passed without new failure on unmacthed (release).

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Commit messages:
 - 8293524: RISC-V: Use macro-assembler functions as appropriate

Changes: https://git.openjdk.org/riscv-port-jdk17u/pull/44/files
 Webrev: https://webrevs.openjdk.org/?repo=riscv-port-jdk17u&pr=44&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293524
  Stats: 78 lines in 13 files changed: 0 ins; 0 del; 78 mod
  Patch: https://git.openjdk.org/riscv-port-jdk17u/pull/44.diff
  Fetch: git fetch https://git.openjdk.org/riscv-port-jdk17u.git pull/44/head:pull/44

PR: https://git.openjdk.org/riscv-port-jdk17u/pull/44