Assert that jump instructions can't also be nonfaulting

gen/generate_jit.js

@@ -138,6 +138,12 @@ function gen_instruction_body(encodings, size)
         if((e.opcode >>> 16) === 0xF3) has_F3 = true;
     }
 
+    console.assert(
+        !encodings.some(e => e.nonfaulting && e.jump),
+        "Unsupported: instruction cannot be both a jump and nonfaulting. Opcode: 0x" + hex(encoding.opcode)
+    );
+
+
     if(has_66 || has_F2 || has_F3)
     {
         console.assert((encoding.opcode & 0xFF00) === 0x0F00);