fix(asm): encode the CMOV condition the renderer prints

The renderer spells a conditional move CMOV plus the condition alone
(CMOVLE, CMOVG), the width carried by the operand registers, so
CMOVLE parsed as the size L and the condition E and encoded CMOVE.
A suffix that is itself a condition name now reads as that condition
with the width from the destination register, and the Plan 9
size-prefixed spellings keep their parse.

Assisted-by: GLM 5.3 Flash

asm/encodable.go

@@ -62,16 +62,14 @@ func Encodable(mnemonic string) bool {
 		return true
 	}
 
-	// CMOV carries size then condition (CMOVLGT); SET carries the condition
-	// alone (SETNE).  The size letter is checked exactly as encodeCmov does,
-	// so a spelling like CMOVBGT is not reported encodable when Encode
-	// would reject it.
-	if rest, ok := strings.CutPrefix(upper, "CMOV"); ok && len(rest) >= 2 {
-		switch rest[0] {
-		case 'W', 'L', 'Q':
-			if _, ok := jccMap[rest[1:]]; ok {
-				return true
-			}
+	// CMOV carries size then condition (CMOVLGT), or the renderer's
+	// condition alone (CMOVLE) with the width from the operand; SET carries
+	// the condition alone (SETNE).  cmovCondition checks the suffix exactly
+	// as encodeCmov does, so a spelling like CMOVBGT is not reported
+	// encodable when Encode would reject it.
+	if rest, ok := strings.CutPrefix(upper, "CMOV"); ok {
+		if _, _, ok := cmovCondition(rest); ok {
+			return true
 		}
 	}
 	if rest, ok := strings.CutPrefix(upper, "SET"); ok {