RFR: 8309418: RISC-V: Make use of vl1r_v & vfabs_v pseudo-instructions where appropriate

[Fei Yang]

On Mon, 5 Jun 2023 06:13:08 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Hi all,
> We should add assembler functions for two pseudo-instructions vl1r_v [1] &
> vfabs_v [2] and use them when appropriate for better readability.
> 
> At the same time, we removed a few unused assembly instructions.  Please take a look
> and have some reviews. Thanks a lot.
> 
> [1] https://github.com/riscv/riscv-v-spec/blob/master/v-spec.adoc#79-vector-loadstore-whole-register-instructions
> [2] https://github.com/riscv/riscv-v-spec/blob/master/v-spec.adoc#1312-vector-floating-point-sign-injection-instructions
> 
> ## Testing:
> qemu w/ UseRVV:
> - [x] Tier1 tests (release)
> - [x] Tier2 tests (release)
> - [ ] Tier3 tests (release)
> - [x] test/jdk/jdk/incubator/vector (release/fastdebug)

Looks good.

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Marked as reviewed by fyang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/14309#pullrequestreview-1461827176