Simplify around `USE_YJIT` macro (#6240)

* Simplify around `USE_YJIT` macro

- Use `USE_YJIT` macro only instead of `YJIT_BUILD`.
- An intermediate macro `YJIT_SUPPORTED_P` is no longer used.

* Bail out if YJIT is enabled on unsupported platforms

1 files changed, 3 insertions, 3 deletions

diff --git a/iseq.c b/iseq.c
index 3d40b88a0d..f17a2d49b6 100644
--- a/iseq.c
+++ b/iseq.c
@@ -175,7 +175,7 @@ rb_iseq_free(const rb_iseq_t *iseq)
         iseq_clear_ic_references(iseq);
         struct rb_iseq_constant_body *const body = ISEQ_BODY(iseq);
         mjit_free_iseq(iseq); /* Notify MJIT */
-#if YJIT_BUILD
+#if USE_YJIT
         rb_yjit_iseq_free(body->yjit_payload);
 #endif
         ruby_xfree((void *)body->iseq_encoded);
@@ -438,7 +438,7 @@ rb_iseq_update_references(rb_iseq_t *iseq)
 #if USE_MJIT
         mjit_update_references(iseq);
 #endif
-#if YJIT_BUILD
+#if USE_YJIT
         rb_yjit_iseq_update_references(body->yjit_payload);
 #endif
     }
@@ -526,7 +526,7 @@ rb_iseq_mark(const rb_iseq_t *iseq)
 #if USE_MJIT
         mjit_mark_cc_entries(body);
 #endif
-#if YJIT_BUILD
+#if USE_YJIT
         rb_yjit_iseq_mark(body->yjit_payload);
 #endif
     }