ZJIT: Split out optimized method types in stats

[tekknolagi]

We can see send/block call/struct aref/... e.g. on lobsters:

Top-9 not optimized method types for send_without_block (100.0% of total 3,133,812):
                   iseq: 2,004,557 (64.0%)
  optimized_struct_aref:   496,232 (15.8%)
                  alias:   268,579 ( 8.6%)
         optimized_call:   224,883 ( 7.2%)
         optimized_send:   120,531 ( 3.8%)
                bmethod:    12,011 ( 0.4%)
                   null:     4,636 ( 0.1%)
   optimized_block_call:     1,930 ( 0.1%)
                  cfunc:       453 ( 0.0%)

railsbench:

Top-8 not optimized method types for send_without_block (100.0% of total 5,735,608):
                   iseq: 2,854,551 (49.8%)
  optimized_struct_aref:   871,459 (15.2%)
         optimized_call:   862,185 (15.0%)
                  alias:   588,486 (10.3%)
         optimized_send:   482,171 ( 8.4%)
                   null:    39,942 ( 0.7%)
                bmethod:    36,784 ( 0.6%)
                  cfunc:        30 ( 0.0%)

shipit:

Top-10 not optimized method types for send_without_block (100.0% of total 4,844,304):
                   iseq: 2,881,206 (59.5%)
  optimized_struct_aref: 1,158,935 (23.9%)
         optimized_call:   472,898 ( 9.8%)
                  alias:   208,010 ( 4.3%)
         optimized_send:    55,479 ( 1.1%)
                   null:    47,273 ( 1.0%)
                bmethod:    12,608 ( 0.3%)
   optimized_block_call:     7,860 ( 0.2%)
                  cfunc:        31 ( 0.0%)
  optimized_struct_aset:         4 ( 0.0%)

[k0kubun]

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