Auto merge of #2888 - Vanille-N:tb-diags, r=RalfJung

TB diagnostics: avoid printing irrelevant events

History contains some events that are relevant to the location but not useful to understand the error.
We can make the selection of events more precise, from only "does it affect the location" to also "is it relevant for this kind of error"

This is also the occasion to fix rust-lang/miri#2867 (comment)

[Solved] Draft: find a way for blanks in the history to not be confusing, as with the current version the history can show the creation as `Reserved` then show where it transitioned from `Frozen` to `Disabled`, but it will say nothing of the `Reserved -> Frozen` leading up to it.

Author: bors