target/i386: Use unit not type in decode_modrm

Rather that enumerating the types that can produce
MMX operands, examine the unit.  No functional change.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Link: https://lore.kernel.org/r/20240812025844.58956-3-richard.henderson@linaro.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

target/i386/tcg/decode-new.c.inc

@@ -1799,13 +1799,13 @@ static void decode_root(DisasContext *s, CPUX86State *env, X86OpEntry *entry, ui
 }
 
 
-static int decode_modrm(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode,
-                        X86DecodedOp *op, X86OpType type)
+static int decode_modrm(DisasContext *s, CPUX86State *env,
+                        X86DecodedInsn *decode, X86DecodedOp *op)
 {
     int modrm = get_modrm(s, env);
     if ((modrm >> 6) == 3) {
         op->n = (modrm & 7);
-        if (type != X86_TYPE_Q && type != X86_TYPE_N) {
+        if (op->unit != X86_OP_MMX) {
             op->n |= REX_B(s);
         }
     } else {
@@ -2040,7 +2040,7 @@ static bool decode_op(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode,
         /* fall through */
     case X86_TYPE_nop:  /* modrm operand decoded but not fetched */
     get_modrm:
-        decode_modrm(s, env, decode, op, type);
+        decode_modrm(s, env, decode, op);
         break;
 
     case X86_TYPE_O:  /* Absolute address encoded in the instruction */