…ods.

…li-obk

Fix an ICE with uninhabited consts

Fixes rust-lang#61744.

r? @oli-obk

rustc: produce AST instead of HIR from `hir::lowering::Resolver` methods.

This avoids synthesizing HIR nodes in `rustc_resolve`, and `rustc::hir::lowering` patching up the result after the fact (I suspect this is even more significant for @Zoxc's chages to arena-allocate the HIR).

r? @oli-obk

…=pnkfelix

Fix error counting

Count duplicate errors for `track_errors` and other error counting checks.
Add FIXMEs to make it clear that we should be moving away from this kind of logic.

Closes rust-lang#61663

Remove built-in derive macros `Send` and `Sync`

Closes rust-lang#62050

… r=Centril

Add test for issue-38591

Closes rust-lang#38591

r? @pnkfelix

… r=Zoxc

HirIdification: almost there

I'm beginning to run out of stuff to HirIdify 😉.

This time I targeted mainly `hir::map::{find, get_parent_node}`, but a few other bits got changed too.

r? @Zoxc

…bk,Centril

Implement From<Local> for Place and PlaceBase

r? @oli-obk
More tiny bits of Place 2.0 moved into master