[pull] master from ruby:master #571
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[Bug #21775]
The changes are to `io.c` and `thread.c`. I changed the API of 2 exported thread functions from `internal/thread.h` that didn't look like they had any use in C extensions: * rb_thread_wait_for_single_fd * rb_thread_io_wait I didn't change the following exported internal function because it's used in C extensions: * rb_thread_fd_select I added a comment to note that this function, although internal, is used in C extensions.
…ocks Previously, the chain_depth>0 version of setlocal blocks did not update the type of the local variable in the context. This can leave the context with stale type information and trigger panics like in [Bug #21772] or lead to miscompilation. To trigger the issue, YJIT needs to see the same ISEQ before and after environment escape and have tracked type info before the escape. To trigger in ISEQs that do not send with a block, it probably requires Kernel#binding or the use of include/ruby/debug.h APIs.
When debugging the fstring table, I found "UTF-8" to be the most common interned strings in many benchmarks. We have a fixed, limited number of these strings, so we might as well permanently cache their fstrings.
ZJIT: Add stack support for CCalls
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