[ruby-core:112552] [Ruby master Bug#19461] Time.local performance tanks in forked process (on macOS only?)

Issue #19461 has been reported by ioquatix (Samuel Williams).

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Bug #19461: Time.local performance tanks in forked process (on macOS only?)
https://bugs.ruby-lang.org/issues/19461

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
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The following program demonstrates a performance regression in forked child processes when invoking `Time.local`:

```ruby
require 'benchmark'
require 'time'

def sir_local_alot
	result = Benchmark.measure do
		10_000.times do
			tm = ::Time.local(2023)
		end
	end
	$stderr.puts result
end

sir_local_alot

pid = fork do
	sir_local_alot
end

Process.wait(pid)
```

On Linux the performance is similar, but on macOS, the performance is over 100x worse on my M1 laptop.




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