Compile opt_send for opt_* only when cc has ISeq

because opt_nil/opt_not/opt_eq populates cc even when it doesn't
fallback to opt_send_without_block because of vm_method_cfunc_is.

```
$ benchmark-driver -v --rbenv 'before --jit;after --jit' benchmark/mjit_opt_cc_insns.yml --repeat-count=4
before --jit: ruby 2.8.0dev (2020-06-22T08:11:24Z master d231b8f95b) +JIT [x86_64-linux]
after --jit: ruby 2.8.0dev (2020-06-22T08:53:27Z master e1125879ed) +JIT [x86_64-linux]
last_commit=Compile opt_send for opt_* only when cc has ISeq
Calculating -------------------------------------
                     before --jit  after --jit
        mjit_nil?(1)      54.106M      73.693M i/s -     40.000M times in 0.739288s 0.542795s
         mjit_not(1)      53.398M      74.477M i/s -     40.000M times in 0.749090s 0.537075s
     mjit_eq(1, nil)       7.427M       6.497M i/s -      8.000M times in 1.077136s 1.231326s

Comparison:
                     mjit_nil?(1)
         after --jit:  73692594.3 i/s
        before --jit:  54106108.4 i/s - 1.36x  slower

                      mjit_not(1)
         after --jit:  74477487.9 i/s
        before --jit:  53398125.0 i/s - 1.39x  slower

                  mjit_eq(1, nil)
        before --jit:   7427105.9 i/s
         after --jit:   6497063.0 i/s - 1.14x  slower
```

Actually opt_eq becomes slower by this. Maybe it's indeed using
opt_send_without_block, but I'll approach that one in another commit.

2 files changed, 4 insertions, 4 deletions

diff --git a/tool/ruby_vm/views/_mjit_compile_send.erb b/tool/ruby_vm/views/_mjit_compile_send.erb
index 8c1c1c094d..71efae9497 100644
--- a/tool/ruby_vm/views/_mjit_compile_send.erb
+++ b/tool/ruby_vm/views/_mjit_compile_send.erb
@@ -20,13 +20,13 @@
     const CALL_INFO ci = cd->ci;
     int kw_splat = IS_ARGS_KW_SPLAT(ci) > 0;
     extern bool rb_splat_or_kwargs_p(const struct rb_callinfo *restrict ci);
-    if (!status->compile_info->disable_send_cache && has_valid_method_type(captured_cc) && (
+    if (!status->compile_info->disable_send_cache && (
 %       # `CC_SET_FASTPATH(cd->cc, vm_call_cfunc_with_frame, ...)` in `vm_call_cfunc`
-        (vm_cc_cme(captured_cc)->def->type == VM_METHOD_TYPE_CFUNC
+        (has_valid_method_type(captured_cc, VM_METHOD_TYPE_CFUNC)
          && !rb_splat_or_kwargs_p(ci) && !kw_splat)
 %       # `CC_SET_FASTPATH(cc, vm_call_iseq_setup_func(...), vm_call_iseq_optimizable_p(...))` in `vm_callee_setup_arg`,
 %       # and support only non-VM_CALL_TAILCALL path inside it
-        || (vm_cc_cme(captured_cc)->def->type == VM_METHOD_TYPE_ISEQ
+        || (has_valid_method_type(captured_cc, VM_METHOD_TYPE_ISEQ)
             && fastpath_applied_iseq_p(ci, captured_cc, iseq = def_iseq_ptr(vm_cc_cme(captured_cc)->def))
             && !(vm_ci_flag(ci) & VM_CALL_TAILCALL))
     )) {
diff --git a/tool/ruby_vm/views/mjit_compile.inc.erb b/tool/ruby_vm/views/mjit_compile.inc.erb
index fa2e52e480..ea145e5b87 100644
--- a/tool/ruby_vm/views/mjit_compile.inc.erb
+++ b/tool/ruby_vm/views/mjit_compile.inc.erb
@@ -56,7 +56,7 @@ switch (insn) {
 %   when *send_compatible_opt_insns
 %     # To avoid cancel, just emit `opt_send_without_block` instead of `opt_*` insn if call cache is populated.
 %     cd_index = insn.opes.index { |o| o.fetch(:type) == 'CALL_DATA' }
-      if (has_valid_method_type(captured_cc_entries(status)[call_data_index((CALL_DATA)operands[<%= cd_index %>], body)])) {
+      if (has_valid_method_type(captured_cc_entries(status)[call_data_index((CALL_DATA)operands[<%= cd_index %>], body)], VM_METHOD_TYPE_ISEQ)) {
 <%=       render 'mjit_compile_send', locals: { insn: opt_send_without_block } -%>
 <%=       render 'mjit_compile_insn', locals: { insn: opt_send_without_block } -%>
           break;