enable constant cache on ractors

constant cache `IC` is accessed by non-atomic manner and there are
thread-safety issues, so Ruby 3.0 disables to use const cache on
non-main ractors.

This patch enables it by introducing `imemo_constcache` and allocates
it by every re-fill of const cache like `imemo_callcache`.
[Bug #17510]

Now `IC` only has one entry `IC::entry` and it points to
`iseq_inline_constant_cache_entry`, managed by T_IMEMO object.

`IC` is atomic data structure so `rb_mjit_before_vm_ic_update()` and
`rb_mjit_after_vm_ic_update()` is not needed.

1 files changed, 0 insertions, 18 deletions

diff --git a/mjit.c b/mjit.c
index 36416c61d1..68d902ab75 100644
--- a/mjit.c
+++ b/mjit.c
@@ -82,24 +82,6 @@ mjit_gc_exit_hook(void)
     CRITICAL_SECTION_FINISH(4, "mjit_gc_exit_hook");
 }
 
-// Lock setinlinecache
-void
-rb_mjit_before_vm_ic_update(void)
-{
-    if (!mjit_enabled)
-        return;
-    CRITICAL_SECTION_START(3, "before vm_ic_update");
-}
-
-// Unlock setinlinecache
-void
-rb_mjit_after_vm_ic_update(void)
-{
-    if (!mjit_enabled)
-        return;
-    CRITICAL_SECTION_FINISH(3, "after vm_ic_update");
-}
-
 // Deal with ISeq movement from compactor
 void
 mjit_update_references(const rb_iseq_t *iseq)