8259948: Aarch64: Add cast nodes for Aarch64 Neon backend

Co-authored-by: Wang Huang <whuang@openjdk.org>
Co-authored-by: Wu Yan <wuyan@openjdk.org>
Co-authored-by: Miao Zhuojun <mouzhuojun@huawei.com>
Reviewed-by: aph, eliu, njian

Author: 3 people

src/hotspot/cpu/aarch64/aarch64.ad

@@ -2401,9 +2401,6 @@ const bool Matcher::match_rule_supported_vector(int opcode, int vlen, BasicType
     // Special cases
     switch (opcode) {
     case Op_VectorMaskCmp:
-    // We don't have VectorReinterpret with bit_size less than 64 support for
-    // now, even for byte type. To be refined with fully VectorCast support.
-    case Op_VectorReinterpret:
       if (vlen < 2 || bit_size < 64) {
         return false;
       }
@@ -2421,23 +2418,6 @@ const bool Matcher::match_rule_supported_vector(int opcode, int vlen, BasicType
         return false;
       }
       break;
-    // Some types of VectorCast are not implemented for now.
-    case Op_VectorCastI2X:
-      if (bt == T_BYTE) {
-        return false;
-      }
-      break;
-    case Op_VectorCastS2X:
-      if (vlen < 4 || bit_size < 64) {
-        return false;
-      }
-      break;
-    case Op_VectorCastF2X:
-    case Op_VectorCastD2X:
-      if (bt == T_INT || bt == T_SHORT || bt == T_BYTE || bt == T_LONG) {
-        return false;
-      }
-      break;
     case Op_LoadVectorGather:
     case Op_StoreVectorScatter:
       return false;