Fix logical NOT operator crash in Arm codegen

This replaces malformed TEQ instruction with proper CMP instruction for
OP_log_not. TEQ requires two operands but was only given one, causing
compilation failures for expressions using the \! operator.

The fix uses CMP to compare the register with 0, followed by conditional
MOV instructions to set the result correctly.

Author: jserv

src/arm-codegen.c

@@ -419,7 +419,7 @@ void emit_ph2_ir(ph2_ir_t *ph2_ir)
         emit(__eor_r(__AL, rd, rn, rm));
         return;
     case OP_log_not:
-        emit(__teq(rn));
+        emit(__cmp_i(__AL, rn, 0));
         emit(__mov_i(__NE, rd, 0));
         emit(__mov_i(__EQ, rd, 1));
         return;