Auto merge of #125611 - GuillaumeGomez:rollup-dfavpgg, r=GuillaumeGomez

Rollup of 7 pull requests

Successful merges:

 - #124870 (Update Result docs to the new guarantees)
 - #125148 (codegen: tweak/extend shift comments)
 - #125522 (Add "better" edition handling on lint-docs tool)
 - #125530 (cleanup dependence of `ExtCtxt` in transcribe when macro expansion)
 - #125535 (clean-up: remove deprecated field `dist.missing-tools`)
 - #125597 (Uplift `EarlyBinder` into `rustc_type_ir`)
 - #125607 (Migrate `run-make/compile-stdin` to `rmake.rs`)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

Cargo.lock

@@ -4686,6 +4686,7 @@ dependencies = [
  "rustc_span",
  "rustc_type_ir_macros",
  "smallvec",
+ "tracing",
 ]
 
 [[package]]

compiler/rustc_codegen_ssa/src/base.rs

@@ -294,12 +294,13 @@ pub fn coerce_unsized_into<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     }
 }
 
-/// Returns `rhs` sufficiently masked, truncated, and/or extended so that
-/// it can be used to shift `lhs`.
+/// Returns `rhs` sufficiently masked, truncated, and/or extended so that it can be used to shift
+/// `lhs`: it has the same size as `lhs`, and the value, when interpreted unsigned (no matter its
+/// type), will not exceed the size of `lhs`.
 ///
-/// Shifts in MIR are all allowed to have mismatched LHS & RHS types.
+/// Shifts in MIR are all allowed to have mismatched LHS & RHS types, and signed RHS.
 /// The shift methods in `BuilderMethods`, however, are fully homogeneous
-/// (both parameters and the return type are all the same type).
+/// (both parameters and the return type are all the same size) and assume an unsigned RHS.
 ///
 /// If `is_unchecked` is false, this masks the RHS to ensure it stays in-bounds,
 /// as the `BuilderMethods` shifts are UB for out-of-bounds shift amounts.