Split out ty::AliasTerm from ty::AliasTy

[compiler-errors]

Splitting out AliasTerm (for use in project and normalizes goals) and AliasTy (for use in ty::Alias)

r? lcnr

[rustbot]

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

This PR changes Stable MIR

cc @oli-obk, @celinval, @ouz-a

changes to the core type system

cc @compiler-errors, @lcnr

changes to the core type system

cc @compiler-errors, @lcnr

changes to the core type system

cc @compiler-errors, @lcnr

Some changes occurred to the core trait solver

cc @rust-lang/initiative-trait-system-refactor

HIR ty lowering was modified

cc @fmease

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy

[lcnr]

r=me after nits

[compiler-errors]

@bors r=lcnr rollup=never (maybe it affects performance)

[bors]

📌 Commit fa84018 has been approved by lcnr

It is now in the queue for this repository.

[bors]

⌛ Testing commit fa84018 with merge 3458211...

[bors]

☀️ Test successful - checks-actions
Approved by: lcnr
Pushing 3458211 to master...

[rust-timer]

Finished benchmarking commit (3458211): comparison URL.

Overall result: ❌ regressions - no action needed

@rustbot label: -perf-regression

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	0.2%	[0.2%, 0.2%]	2
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.2%	[0.2%, 0.2%]	2

Max RSS (memory usage)

This benchmark run did not return any relevant results for this metric.

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 676.19s -> 678.96s (0.41%)
Artifact size: 315.97 MiB -> 316.10 MiB (0.04%)