add IR encoding for EnterNode (#53482)

fixes #53248

Author: JeffBezanson

src/ircode.c

@@ -322,6 +322,11 @@ static void jl_encode_value_(jl_ircode_state *s, jl_value_t *v, int as_literal)
         jl_encode_value(s, jl_get_nth_field(v, 0));
         jl_encode_value(s, jl_get_nth_field(v, 1));
     }
+    else if (jl_is_enternode(v)) {
+        write_uint8(s->s, TAG_ENTERNODE);
+        jl_encode_value(s, jl_get_nth_field(v, 0));
+        jl_encode_value(s, jl_get_nth_field(v, 1));
+    }
     else if (jl_is_argument(v)) {
         write_uint8(s->s, TAG_ARGUMENT);
         jl_encode_value(s, jl_get_nth_field(v, 0));
@@ -721,6 +726,11 @@ static jl_value_t *jl_decode_value(jl_ircode_state *s) JL_GC_DISABLED
         set_nth_field(jl_gotoifnot_type, v, 0, jl_decode_value(s), 0);
         set_nth_field(jl_gotoifnot_type, v, 1, jl_decode_value(s), 0);
         return v;
+    case TAG_ENTERNODE:
+        v = jl_new_struct_uninit(jl_enternode_type);
+        set_nth_field(jl_enternode_type, v, 0, jl_decode_value(s), 0);
+        set_nth_field(jl_enternode_type, v, 1, jl_decode_value(s), 0);
+        return v;
     case TAG_ARGUMENT:
         v = jl_new_struct_uninit(jl_argument_type);
         set_nth_field(jl_argument_type, v, 0, jl_decode_value(s), 0);

src/serialize.h

@@ -65,8 +65,9 @@ extern "C" {
 #define TAG_RELOC_METHODROOT   57
 #define TAG_BINDING            58
 #define TAG_MEMORYT            59
+#define TAG_ENTERNODE          60
 
-#define LAST_TAG 59
+#define LAST_TAG 60
 
 #define write_uint8(s, n) ios_putc((n), (s))
 #define read_uint8(s) ((uint8_t)ios_getc((s)))