Hi,

we have added VectorTest node, It was implemented by referring to RVV v1.0 [1]. please take a look and have some reviews. Thanks a lot.

VectorTestDemo case:

```
import jdk.incubator.vector.ByteVector;
import jdk.incubator.vector.VectorMask;

public class VectorTestDemo {
    static boolean[] d = new boolean[]{true, false, false, false, false, false, false, false};
    static VectorMask<Byte> avmask = VectorMask.fromArray(ByteVector.SPECIES_64, d, 0);

    public static void main(String[] args) {
        for (int i = 0; i < 300000; i++) {
            
            final boolean alltrue = alltrue();
            if (alltrue != false) {
                throw new RuntimeException("alltrue");
            }
            final boolean anytrue = anytrue();
            if (anytrue != true) {
                throw new RuntimeException("anytrue");
            }
        }
    }

    public static boolean anytrue() {
        return avmask.anyTrue();
    }

    public static boolean alltrue() {
        return avmask.allTrue();
    }
}

```
We can compile `VectorTestDemo.java` using `javac --add-modules jdk.incubator.vector VectorTestDemo.java`, and use `./java -XX:-TieredCompilation -XX:+UnlockExperimentalVMOptions -XX:+UseRVV -XX:+PrintOptoAssembly -XX:+LogCompilation -XX:LogFile=compile.log VectorTestDemo > aaa.log` to start the test case, we can observe the specified compilation log, `compile.log`, which contains the VectorTest node for the PR implementation.
Some of the compilation logs of VectorTestDemo#anytrue method are as follows.
```
05e lwu R28, [R7, #12] # loadN, compressed ptr, #@loadN ! Field: jdk/internal/vm/vector/VectorSupport$VectorPayload.payload (constant)
062 decode_heap_oop R7, R28 #@decodeHeapOop
066 addi R7, R7, #16 # ptr, #@addP_reg_imm
068 loadV V1, [R7] # vector (rvv)
070 vloadmask V0, V1
078 CMove R10, (vectortest eq V0 V0), zero, one #@cmovI_vtest_anytrue_negate
```
Some of the compilation logs of the VectorTestDemo#alltrue method are as follows.
```
05e lwu R28, [R7, #12] # loadN, compressed ptr, #@loadN ! Field: jdk/internal/vm/vector/VectorSupport$VectorPayload.payload (constant)
062 decode_heap_oop R7, R28 #@decodeHeapOop
066 addi R7, R7, #16 # ptr, #@addP_reg_imm
068 loadV V1, [R7] # vector (rvv)
070 vloadmask V0, V1
078 CMove R10, (vectortest ne V0 V0), zero, one #@cmovI_vtest_alltrue_negate
```
Some of the compilation logs of VectorTest#main method are as follows.
```
0b2 decode_heap_oop R7, R7 #@decodeHeapOop
0b4 addi R7, R7, #16 # ptr, #@addP_reg_imm
0b6 loadV V1, [R7] # vector (rvv)
0be vloadmask V0, V1
0c6 CMove R28, (vectortest eq V0 V0), zero, one #@cmovI_vtest_anytrue_negate
0d2 beq (vectortest overflow V0, V0) B8 #@vtest_alltrue_branch P=0.000001 C=-1.000000
```
As comment in the PR in cmovI_vtest_anytrue instruct, cmpOp is negated in CMoveINode::Ideal. So we kept this version for better understanding of the code change.

[1] https://github.com/riscv/riscv-v-spec/blob/v1.0/v-spec.adoc