[riscv-port-jdk11u:riscv-port] RFR: 8293524: RISC-V: Use macro-assembler functions as appropriate [v2]

[Dingli Zhang]

> Please review this backport to riscv-port-jdk11u.
> Backport of [JDK-8293524](https://bugs.openjdk.org/browse/JDK-8293524).
> The original patch cannot be directly applied because jdk11u has no [JDK-8241436 ](https://bugs.openjdk.org/browse/JDK-8241436 ) and [JDK-8229258](https://bugs.openjdk.org/browse/JDK-8229258) . Also jdk11u does not have generate_bigIntegerLeftShift and generate_bigIntegerRightShift functions.
> 
> Testing:
> - Tier1 passed without new failure on lp4a (release).

Dingli Zhang has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

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

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

Changes:
  - all: https://git.openjdk.org/riscv-port-jdk11u/pull/34/files
  - new: https://git.openjdk.org/riscv-port-jdk11u/pull/34/files/8140338d..0c4fca28

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=riscv-port-jdk11u&pr=34&range=01
 - incr: https://webrevs.openjdk.org/?repo=riscv-port-jdk11u&pr=34&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/riscv-port-jdk11u/pull/34.diff
  Fetch: git fetch https://git.openjdk.org/riscv-port-jdk11u.git pull/34/head:pull/34

PR: https://git.openjdk.org/riscv-port-jdk11u/pull/34