Fix instruction length calculation for TFM compatibility operations The compatibility operations for TFM (TFRP, COPY+, etc.) were using the opcode as the length instead of the length of the opcode as the length. This corrects that oversight. Interestingly, this error has been present forever which gives a fair indication that almost nobody uses these compatibility instructions.

--- a/lwasm/insn_tfm.c	Sun Dec 19 17:46:02 2021 -0700
+++ b/lwasm/insn_tfm.c	Sun Jan 02 00:59:21 2022 -0700
@@ -149,7 +149,7 @@
 			r0 = r1 = 0;
 		}
 	}
-	l -> len = instab[l -> insn].ops[0] + 1;
+	l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
 	l -> pb = (r0 << 4) | r1;
 }