Implement calls to methods with simple optional params

* Implement calls to methods with simple optional params

* Remove unnecessary MJIT_STATIC

See comment for MJIT_STATIC. I added it not knowing whether it's
required because the function next to it has it. Don't use it and wait
for problems to come up instead.

* Better naming, some comments

* Count bailing on kw only iseqs

On railsbench:
```
opt_send_without_block exit reasons:
                  bmethod      59729 (27.7%)
         optimized_method      59137 (27.5%)
      iseq_complex_callee      41362 (19.2%)
             alias_method      33346 (15.5%)
      callsite_not_simple      19170 ( 8.9%)
       iseq_only_keywords       1300 ( 0.6%)
                 kw_splat       1299 ( 0.6%)
    cfunc_ruby_array_varg         18 ( 0.0%)
```

0 files changed, 0 insertions, 0 deletions