default binary size increase due to ice dumps logic

[oli-obk]

#108714 slightly increased default binary size (checked on x86_64-pc-windows-msvc), the reason is now code

rust/library/std/src/panicking.rs

Lines 304 to 308 in a0c28cd

	if let Some(path) = path
	&& let Ok(mut out) = crate::fs::File::options().create(true).append(true).open(&path)
	{
	write(&mut out, BacktraceStyle::full());
	}

unconditionally includes File::open (~ 2kb out of 130) and friends. can be tracked back by new imports of CreateFileW, GetFullPathNameW for rustc empty.rs -Copt-level=3 -Cdebuginfo=0 -Clto=yes -Ccodegen-units=1 -Cpanic=abort --edition=2018 where empty.rs is fn main(){}

Originally posted by @klensy in #108714 (comment)

[oli-obk]

cc @estebank

[cuviper]

cc @rust-lang/libs -- I'm surprised that #108714 didn't include any libs review in the first place, having modified the default panic hook. Maybe rustc ought to be registering its own panic hook instead?

[klensy]

Size changed back to 123kb.