aarch64: rcpc3: Define RCPC3_INSN macro

This patch adds the necessary macro for encoding FEAT_RCPC3-dependent
instructions in Binutils.

opcodes/aarch64-tbl.h

@@ -2886,6 +2886,8 @@ static const aarch64_feature_set aarch64_feature_rcpc3 =
   { NAME, OPCODE, MASK, the, 0, THE, OPS, QUALS, FLAGS, 0, 0, NULL }
 #define D128_THE_INSN(NAME,OPCODE,MASK,OPS,QUALS,FLAGS) \
   { NAME, OPCODE, MASK, the, 0, D128_THE, OPS, QUALS, FLAGS, 0, 0, NULL }
+#define RCPC3_INSN(NAME,OPCODE,MASK,CLASS,OPS,QUALS,FLAGS) \
+  { NAME, OPCODE, MASK, CLASS, 0, RCPC3, OPS, QUALS, FLAGS, 0, 0, NULL }
 
 #define MOPS_CPY_OP1_OP2_PME_INSN(NAME, OPCODE, MASK, FLAGS, CONSTRAINTS) \
   MOPS_INSN (NAME, OPCODE, MASK, 0, \