Rollup merge of #124284 - klensy:no-reads, r=fmease

parser: remove unused(no reads) max_angle_bracket_count field

Isn't there (clippy) lint for variables with only writes? They should be marked as dead too, probably.
Found only https://rust-lang.github.io/rust-clippy/master/index.html#/collection_is_never_read

Author: matthiaskrgr