Auto merge of #86619 - rylev:incr-hashing-profiling, r=wesleywiser

Profile incremental compilation hashing fingerprints

Adds profiling instrumentation for the hashing of incremental compilation fingerprints per query.

This will eventually feed into the `measureme` and `rustc-perf` infrastructure for tracking if computing hashes changes over time.

TODOs:
* [x] Address the FIXME where we are including node interning in the hash timing.
* [ ] Update measureme/summarize to handle this new data: https://github.com/rust-lang/measureme/pull/166
* [ ] ~Update rustc-perf to handle the new data from measureme~ (will be done at a later time)

r? `@ghost`

cc `@michaelwoerister`

compiler/rustc_session/src/options.rs

@@ -1250,7 +1250,7 @@ options! {
         "specify the events recorded by the self profiler;
         for example: `-Z self-profile-events=default,query-keys`
         all options: none, all, default, generic-activity, query-provider, query-cache-hit
-                     query-blocked, incr-cache-load, query-keys, function-args, args, llvm"),
+                     query-blocked, incr-cache-load, incr-result-hashing, query-keys, function-args, args, llvm"),
     share_generics: Option<bool> = (None, parse_opt_bool, [TRACKED],
         "make the current crate share its generic instantiations"),
     show_span: Option<String> = (None, parse_opt_string, [TRACKED],