ZJIT: Support optional keyword arguments in direct send (#15873)HEADmaster

This fills in constants when unspecified optional keyword args have static default values.
For complex defaults we calculate the kw_bits and utilize the checkkeyword logic we already had.

The following benchmarks used to register param_kw_opt.
Some of them (like graphql*) just trade that for some other complexity, or "too_many_args_for_lir".
Notable improvements include activerecord where the previous param_kw_opt count has a corresponding drop in complex args and dynamic_send_count and a nearly equal rise in optimized_send_count.
The gains are similar but not as complete in hexapdf, liquid-render, lobsters, railsbench, shipit.

| Benchmark | param_kw_opt | Δ one_or_more_complex | Δ too_many_args | Δ dynamic_send | Δ optimized_send |
|-----------|-------------:|----------------------:|----------------:|---------------:|-----------------:|
| activerecord | 6,307,141 | -6,253,823 | +4,084 | -6,306,223 | +6,279,766 |
| blurhash | 21 | -21 | +0 | -23 | +20 |
| chunky-png | 813,604 | -813,604 | +0 | -813,616 | +813,556 |
| erubi-rails | 1,590,395 | -590,274 | +35,578 | -552,914 | +550,826 |
| fluentd | 4,906 | -4,854 | +21 | -5,745 | +5,080 |
| graphql | 1,610,439 | -1,610,432 | +1,605,751 | -4,688 | +4,628 |
| graphql-native | 16,332,386 | -16,332,375 | +16,309,681 | -22,701 | +22,638 |
| hexapdf | 9,165,465 | -9,124,509 | +203,754 | -8,920,727 | +8,839,295 |
| liquid-compile | 14,817 | -14,792 | +0 | -14,705 | +15,045 |
| liquid-render | 3,994,905 | -3,994,901 | +0 | -3,994,868 | +3,020,779 |
| lobsters | 2,467,510 | -2,297,298 | +205,610 | -2,216,583 | +1,694,092 |
| protoboeuf | 11,521 | -11,521 | +0 | -11,523 | +11,520 |
| psych-load | 77,612 | -77,609 | +29,942 | -77,613 | -12,242 |
| rack | 2,743 | -2,742 | +0 | -2,750 | +2,668 |
| railsbench | 3,579,778 | -2,517,615 | +432,575 | -2,084,480 | +1,882,928 |
| ruby-lsp | 287,171 | -379,716 | +37 | -409,368 | -267,248 |
| rubyboy | 5,993,004 | -5,993,003 | +0 | -5,993,006 | +5,992,993 |
| sequel | 182,652 | -182,631 | +0 | -182,563 | +122,687 |
| shipit | 3,289,456 | -2,778,419 | +306,867 | -3,201,395 | +1,068,505 |
| tinygql | 2,732 | -2,732 | +1 | -2,734 | +2,729 |

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