Auto merge of rust-lang#103898 - Nilstrieb:match-macro, r=nnethercote

Retry failed macro matching for diagnostics

When a declarative macro fails to match, retry the matching to collect diagnostic info instead of collecting it on the fly in the hot path. Split out of rust-lang#103439.

You made a bunch of changes to declarative macro matching, so
r? `@nnethercote`

This change should produce a few small perf wins: rust-lang#103439 (comment)