Auto merge of #120771 - oli-obk:useless_non_ensure_query_call, r=davidtwco

Use `ensure` when the result of the query is not needed beyond its `Result`ness

while I would like to just remove the `tcx` methods for ensure-only queries, that is hard to do without another query annotation or by turning the `define_callbacks` macro into a proc macro to get more control

should fix perf regression of rust-lang/rust#120558

Author: bors