Rollup merge of #122299 - compiler-errors:bt-for-must-diag, r=nnethercote

Store backtrace for `must_produce_diag`

This makes it significantly easier to debug a `must_produce_diag` ICE, since we have no other way to know where the heck the bug originates from.

Backtrace rendering kinda sucks right now since we're just printing it in the panic message; happy to apply some suggestions to make it prettier or reuse other bug printing machinery, but also don't want to iterate too much on the rendering since this really is just for debug purposes.

r? nnethercote

Author: workingjubilee