RFR: 8301818: RISC-V: Factor out function mvw from MacroAssembler

[Ludovic Henry]

On Sat, 4 Feb 2023 06:42:33 GMT, Gui Cao <gcao at openjdk.org> wrote:

> HI,
> 
> The two functions of mvw and mv overlap, we can use mv to replace mvw, so the mvw function can be removed. and format some code.
> ## Testing:
> - all tier1 on unmatched board without new failures

src/hotspot/cpu/riscv/vtableStubs_riscv.cpp line 92:

> 90: 
> 91:     // check offset vs vtable length
> 92:     __ lwu(t0, Address(t2, Klass::vtable_length_offset()));

There is an extra `lwu` -> `lw` which doesn't happen anywhere else.

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PR: https://git.openjdk.org/jdk/pull/12425