delegation: support mapping of all arguments with Self type

[aerooneqq]

This PR supports applying target expression to arguments of Self type.
That the first part of this feature which touches AST -> HIR lowering only and allows lowering of delegation's block several tumes when there are no definitions inside.
The second part will adjust typeck so we can apply adjustments to all mapped arguments as to the first argument of delegation. This should also eventually weak the condition of argument mapping allowing Box<Self>, Arc<Self>, etc.

Part of #118212.
r? @petrochenkov

[aerooneqq]

Blocked on #158434.
@rustbot blocked

[rust-log-analyzer]

The job x86_64-gnu-gcc-core-tests failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

   --> compiler/rustc_ast_lowering/src/lib.rs:112:9
    |
111 |     pub(crate) struct ReloweringChecker {
    |                       ----------------- fields in this struct
112 |         node_id_to_local_id: NodeMap<hir::ItemLocalId>,
    |         ^^^^^^^^^^^^^^^^^^^
113 |         relowering_permissions_count: usize,
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `ReloweringChecker` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default

warning: method `check` is never used
   --> compiler/rustc_ast_lowering/src/lib.rs:117:23
    |
116 |     impl ReloweringChecker {
    |     ---------------------- method in this implementation
117 |         pub(crate) fn check(&mut self, ast_node_id: NodeId, local_id: hir::ItemLocalId) {
    |                       ^^^^^

[RUSTC-TIMING] rustc_ast_lowering test:false 22.088
error: `rustc_ast_lowering` (lib) generated 2 warnings
error: warnings are denied by `build.warnings` configuration

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