insns.def: Drop unused leafness_of_check_ints

It was used to let MJIT override the leafness of the instruction when it
decides to remove check_ints for it. Now that MJIT is gone, nobody needs
to "override" the leafness using this.

Author: k0kubun

insns.def

@@ -1206,7 +1206,7 @@ jump
 ()
 ()
 /* Same discussion as leave. */
-// attr bool leaf = leafness_of_check_ints; /* has rb_threadptr_execute_interrupts() */
+// attr bool leaf = false; /* has rb_threadptr_execute_interrupts() */
 {
     RUBY_VM_CHECK_INTS(ec);
     JUMP(dst);
@@ -1219,7 +1219,7 @@ branchif
 (VALUE val)
 ()
 /* Same discussion as jump. */
-// attr bool leaf = leafness_of_check_ints; /* has rb_threadptr_execute_interrupts() */
+// attr bool leaf = false; /* has rb_threadptr_execute_interrupts() */
 {
     if (RTEST(val)) {
         RUBY_VM_CHECK_INTS(ec);
@@ -1234,7 +1234,7 @@ branchunless
 (VALUE val)
 ()
 /* Same discussion as jump. */
-// attr bool leaf = leafness_of_check_ints; /* has rb_threadptr_execute_interrupts() */
+// attr bool leaf = false; /* has rb_threadptr_execute_interrupts() */
 {
     if (!RTEST(val)) {
         RUBY_VM_CHECK_INTS(ec);
@@ -1249,7 +1249,7 @@ branchnil
 (VALUE val)
 ()
 /* Same discussion as jump. */
-// attr bool leaf = leafness_of_check_ints; /* has rb_threadptr_execute_interrupts() */
+// attr bool leaf = false; /* has rb_threadptr_execute_interrupts() */
 {
     if (NIL_P(val)) {
         RUBY_VM_CHECK_INTS(ec);

tool/ruby_vm/models/bare_instructions.rb

@@ -111,10 +111,6 @@ def always_leaf?
     @attrs.fetch('leaf').expr.expr == 'true;'
   end
 
-  def leaf_without_check_ints?
-    @attrs.fetch('leaf').expr.expr == 'leafness_of_check_ints;'
-  end
-
   def handle_canary stmt
     # Stack canary is basically a good thing that we want to add, however:
     #

tool/ruby_vm/views/_leaf_helpers.erb

@@ -10,10 +10,6 @@
 
 #include "iseq.h"
 
-// This is used to tell JIT that this insn would be leaf if CHECK_INTS didn't exist.
-// It should be used only when RUBY_VM_CHECK_INTS is directly written in insns.def.
-static bool leafness_of_check_ints = false;
-
 static bool
 leafness_of_defined(rb_num_t op_type)
 {