Hi, I noticed the following warning in the Opto JIT Code for the Vector API in the `test/jdk/jdk/incubator/vector/Int256VectorTests.java: UNSIGNED_LTInt256VectorTests` test:
```
  ** not supported: unsigned comparison op=comp/1 vlen=8 etype=int ismask=usestore
```
After this Patch, We supports vector unsigned comparison instructions, the test passes normally and generates the Opto JIT Code such as:
```
23e B46: # out( B48 B47 ) <- in( B25 B45 ) Loop( B46-B45 ) Freq: 955.829
23e addw R24, R29, zr #@convI2L_reg_reg
242 slli R30, R24, (#2 & 0x3f) #@lShiftL_reg_imm
246 add R17, R8, R30 # ptr, #@addP_reg_reg
24a add R19, R9, R30 # ptr, #@addP_reg_reg
24e addi R30, R17, #16 # ptr, #@addP_reg_imm
252 addi R31, R19, #16 # ptr, #@addP_reg_imm
256 loadV V1, [R30] # vector (rvv)
25e loadV V2, [R31] # vector (rvv)
266 vmaskcmp V0, V1, V2, #19
272 vmask_tolong R20, V0
280 vstoremask V1, V0 # elem size is #4 byte[s]
28c lw R31, [R17, #16] # int, #@loadI
290 lw R11, [R19, #16] # int, #@loadI
294 andi R10, R20, #1 #@andL_reg_imm
298 bne R10, zr, B48 #@cmpL_reg_imm0_branch P=0.669978 C=14596.000000
```