RFR: 8301628: RISC-V: c2 fix pipeline class for several instructions [v2]

[Gui Cao]

> HI,
> 
> The current C2 instructions can use some more accurate ins_pipe, eg.:
> 
> instruct regI_not_reg(iRegINoSp dst, iRegI src1, immI_M1 m1) %{
>   match(Set dst (XorI src1 m1));
>   ins_cost(ALU_COST);
>   format %{ "xori  $dst, $src1, -1\t#@regI_not_reg" %}
> 
>   ins_encode %{
>     __ xori(as_Register($dst$$reg), as_Register($src1$$reg), -1);
>   %}
> 
>   ins_pipe(ialu_reg);
> %}
> 
> 
> We can use the more accurate pipe_class `ialu_reg_imm` instead.
> 
> Please take a look and have some reviews. Thanks a lot.
> 
> ## Testing:
> - hotspot and jdk tier1 on unmatched board without new failures

Gui Cao has updated the pull request incrementally with one additional commit since the last revision:

  Fix typo error

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12379/files
  - new: https://git.openjdk.org/jdk/pull/12379/files/64666538..317cb90e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12379&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12379&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12379.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12379/head:pull/12379

PR: https://git.openjdk.org/jdk/pull/12379