Auto merge of rust-lang#145284 - nnethercote:type_name-print-regions, r=lcnr

Print regions in `type_name`.

Currently they are skipped, which is a bit weird, and it sometimes causes malformed output like `Foo<>` and `dyn Bar<, A = u32>`.

Most regions are erased by the time `type_name` does its work. So all regions are now printed as `'_` in non-optional places. Not perfect, but better than the status quo.

`c_name` is updated to trim lifetimes from MIR pass names, so that the `PASS_NAMES` sanity check still works. It is also renamed as `simplify_pass_type_name` and made non-const, because it doesn't need to be const and the non-const implementation is much shorter.

The commit also renames `should_print_region` as `should_print_optional_region`, which makes it clearer that it only applies to some regions.

Fixes rust-lang#145168.

r? `@lcnr`

Author: bors

core/src/any.rs

@@ -835,9 +835,9 @@ impl fmt::Debug for TypeId {
 ///
 /// The returned string must not be considered to be a unique identifier of a
 /// type as multiple types may map to the same type name. Similarly, there is no
-/// guarantee that all parts of a type will appear in the returned string: for
-/// example, lifetime specifiers are currently not included. In addition, the
-/// output may change between versions of the compiler.
+/// guarantee that all parts of a type will appear in the returned string. In
+/// addition, the output may change between versions of the compiler. For
+/// example, lifetime specifiers were omitted in some earlier versions.
 ///
 /// The current implementation uses the same infrastructure as compiler
 /// diagnostics and debuginfo, but this is not guaranteed.