Allow asserts and panics to abort process quietly. #54981
Description
Currently assertions cause executable to be bloated up by various formatting-related symbols like
0.5% 2.8% 1020B std <core::fmt::builders::PadAdapter<'_> as core::fmt::Write>::write_str
0.4% 2.3% 860B std core::char::methods::<impl char>::escape_debug
0.4% 2.2% 804B std core::fmt::Formatter::pad_integral
, causing executables that carefully choose functions to call in order to stay under X kilobytes to suddenly grow by about 40-150 kilobytes. Additionally, pthread_* symbols appear in otherwise single-threaded module. Symbol count may jump by about 800.
Shall there be some mode (like panic = "really-abort") or a libstd feature settable in Xargo.toml that makes all panics just do plain raw abort without trying to collect backtrace or print anything at all?