RFR: 8318225: RISC-V: C2 UModI

[Hamlin Li]

Hi,
Can you review the change to add intrinsic for UModI and UModL?
( This is a quite similar patch to https://github.com/openjdk/jdk/pull/16346, which addresses UDivI and UDivL, so for the performance consideration please also check the discussion in that pr. )
Thanks!


## Tests

### Functionality
Run tests successfully found via `grep -nr test/jdk/ -we remainderUnsigned` and `grep -nr test/hotspot/ -we remainderUnsigned` 

### Performance

#### Long
**NOTE: for positive divisor, it's the common case; for negative divisor, it's a rare case**

**Before**

LongDivMod.testRemainderUnsigned                 1024          mixed  avgt   10  21222.911 ± 57.735  ns/op
LongDivMod.testRemainderUnsigned                 1024       positive  avgt   10  28841.429 ±  6.294  ns/op
LongDivMod.testRemainderUnsigned                 1024       negative  avgt   10   7733.038 ±  3.856  ns/op


**After**

LongDivMod.testRemainderUnsigned                 1024          mixed  avgt   10  22666.448 ± 34.986  ns/op
LongDivMod.testRemainderUnsigned                 1024       positive  avgt   10  15967.846 ± 24.805  ns/op
LongDivMod.testRemainderUnsigned                 1024       negative  avgt   10  29507.865 ± 20.593  ns/op


#### Integer
**Before**

IntegerDivMod.testRemainderUnsigned                 1024          mixed  avgt   10  23396.475 ± 24.065  ns/op
IntegerDivMod.testRemainderUnsigned                 1024       positive  avgt   10  16796.796 ±  3.389  ns/op
IntegerDivMod.testRemainderUnsigned                 1024       negative  avgt   10  30159.407 ±  6.716  ns/op


**After**

IntegerDivMod.testRemainderUnsigned                 1024          mixed  avgt   10  23216.710 ± 14.351  ns/op
IntegerDivMod.testRemainderUnsigned                 1024       positive  avgt   10  16621.374 ±  3.203  ns/op
IntegerDivMod.testRemainderUnsigned                 1024       negative  avgt   10  30002.088 ± 41.212  ns/op

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

Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/16394/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16394&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318225
  Stats: 46 lines in 2 files changed: 44 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16394.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16394/head:pull/16394

PR: https://git.openjdk.org/jdk/pull/16394