Rollup merge of #123389 - ChrisDenton:dont-panic-on-startup, r=joboet

Avoid panicking unnecessarily on startup

On Windows, in `lang_start` we add an exception handler to catch stack overflows and we also reserve some stack space for the handler. Both of these are useful but they're not strictly necessary. The standard library has to work without them (e.g. if Rust is used from a foreign entry point) and the negative effect of not doing them is limited (i.e. you don't get the friendly stack overflow message).

As we really don't want to panic pre-main unless absolutely necessary, it now won't panic on failure. I've added some debug assertions so as to avoid programmer error.

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