[pull] master from ruby:master - #1344
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[Feature #21700]
We only use either positions and succ_index_table (when VM_INSN_INFO_TABLE_IMPL == 2, positions is converted to succ_index_table), so we waste 8 bytes in rb_iseq_constant_body. This changes it so that they are in a union.
(ruby/json#1062) Add JSON::ParserError#json_path ruby/json@9ae76bdd3d Co-authored-by: Jean Boussier <byroot@ruby-lang.org>
Raise YJIT case dispatch specialization limit to 256
Most of the time in a production app most iseqs won't have iseq->body->variable set to anything non-default. We can allocate it lazily and save 32 bytes per iseq. Some large apps have millions of iseqs, so it adds up. 32B saved per iseq * 2mil iseqs =~ 64 MB
If we don't pre-size the HashMap, it has to re-hash when resizing. Hashing a SideExit is slow. Give a size hint so we only hash ~once per exit.
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