[PATCH] [ruby/timeout] Compatibility with Fiber scheduler. (https://github.com/ruby/timeout/pull/97)

	[Bug #21947]

	https://github.com/ruby/timeout/commit/55d7c84b50

	[PATCH] YJIT: Fix not reading locals from `cfp->ep` after `YJIT.enable` and exceptional entry
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	Fix for [Bug #21941].

	In case of `--yjit-disable`, YJIT only starts to record environment
	escapes after `RubyVM::YJIT.enable`. Previously we falsely assumed that
	we always have a full history all the way back to VM boot. This had YJIT
	install and run code that assume EP=BP when EP≠BP for some exceptional
	entry into the middle of a running frame, if the environment escaped
	before `YJIT.enable`.

	The fix is to reject exceptional entry with an escaped environment.
	Rename things and explain in more detail how the predicate for deciding
	to assume EP=BP works. It's quite subtle since it reasons about all
	parties in the system that push a control frame and then run JIT code.

	Note that while can_assume_on_stack_env() checks the currently running
	environment if it so happens to be the one YJIT is compiling against, it
	can return true for any ISEQ. The check isn't necessary for fixing the
	bug, and the load bearing part of this patch is the change to
	exceptional entries.

	This fix is flat on speed and space on ruby-bench headline benchmarks.

	Many thanks for the community effort to create a small test case for
	this bug.

[Bug #22018]

ISeq returned by `RubyVM::InstructionSequene.load_iseq` weren't
handled by the coverage module.

	[PATCH] [Bug #22004] Fix short-circuited loop conditions

Extends the @_init guard to def_method so that an ERB object created
via Marshal.load (which bypasses initialize) raises ArgumentError
instead of evaluating arbitrary source. def_module and def_class both
delegate to def_method and are covered by the same check.

Co-authored-by: Tristan Madani <TristanInSec@gmail.com>

[Bug #21992]

When redefining `BasicObject#initialize` there's no super class to
access.

Method#unbind clones the method entry, preserving its defined_class.
For methods mixed in via include/extend, defined_class is an ICLASS,
causing UnboundMethod#== to return false when comparing against the
same method obtained via Module#instance_method.

Resolve ICLASS defined_class in method_eq.

[Bug #21873]