… solver

This matches clang's behavior and makes split-debuginfo behave as expected (i.e. actually split the debug info).

Fixes rust-lang#106592

…oli-obk

Add log-backtrace option to show backtraces along with logging

according to rust-lang#90698, I added a compiler option, `-Zlog-backtrace=filter`, where `filter` is a module name, to show backtraces for logging without rebuilding.

resolve rust-lang#90698

…, r=lcnr

Check `impl`'s `where` clauses in `consider_impl_candidate` in experimental solver

Check impl's nested predicates as part of the recursive evaluate in `consider_impl_candidate`.

<sub>Unless, for some reason, these are intentionally **not** checked here -- in which case, I really don't understand where they're being checked...<sub>

r? ``@lcnr``

Improve fluent error messages

These have been really frustrating me while migrating diagnostics.

…Titor

add tests for div_duration_* functions

Per rust-lang#63139 (comment)

this adds unit tests for the functions that will hopefully effectively demonstrate that `div_duration` is ready to be stabilized.

…-errors

Polymorphization cleanup

Split out of rust-lang#106233

Use a newtype instead of a bitset directly. This makes the code way easier to read and easier to adapt for future changes.

…e-lseek, r=cuviper

Remove unnecessary lseek syscall when using std::fs::read

Fixes rust-lang#106597
r? ``@bjorn3``

…_by_default, r=davidtwco

Disable "split dwarf inlining" by default.

This matches clang's behavior and makes split-debuginfo behave as expected (i.e. actually split the debug info).

Fixes rust-lang#106592

Autolabel and ping wg for changes to new solver

r? ``@lcnr``

fix typo LocalItemId -> ItemLocalId