vm_insnhelper.c: never cache getinstancevariable twice

We have several options to ensure there's no race condition between main
thread and MJIT thead about IC reference:

1) Give up caching ivar for multiple classes (or multiple versions of the
   same class) in the same getinstancevariable (This commit's approach)
2) Allocate new inline cache every time

Other ideas we could think of couldn't eliminate possibilities of race
condition.
In 2, it's memory allocation would be slow and it may trigger JIT
cancellation frequently. So 1 would be fast for both VM and JIT
situations.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65213 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/vm.c b/vm.c
index fababaa2ec..88a7ef39fa 100644
--- a/vm.c
+++ b/vm.c
@@ -340,7 +340,7 @@ rb_event_flag_t ruby_vm_event_flags;
 rb_event_flag_t ruby_vm_event_enabled_flags;
 rb_serial_t ruby_vm_global_method_state = 1;
 rb_serial_t ruby_vm_global_constant_state = 1;
-rb_serial_t ruby_vm_class_serial = 1;
+rb_serial_t ruby_vm_class_serial = RUBY_VM_CLASS_SERIAL_MIN_VALID_VALUE;
 
 static void thread_free(void *ptr);