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Remove `rustc_middle::mir::tcx` module. This is a really weird module. For example, what does `tcx` in `rustc_middle::mir::tcx::PlaceTy` mean? The answer is "not much". The top-level module comment says: > Methods for the various MIR types. These are intended for use after > building is complete. Awfully broad for a module that has a handful of impl blocks for some MIR types, none of which really relates to `TyCtxt`. `git blame` indicates the comment is ancient, from 2015, and made sense then. This module is now vestigial. This commit removes it and moves all the code within into `rustc_middle::mir::statement`. Some specifics: - `Place`, `PlaceRef`, `Rvalue`, `Operand`, `BorrowKind`: they all have `impl` blocks in both the `tcx` and `statement` modules. The commit merges the former into the latter. - `BinOp`, `UnOp`: they only have `impl` blocks in `tcx`. The commit moves these into `statement`. - `PlaceTy`, `RvalueInitializationState`: they are defined in `tcx`. This commit moves them into `statement` *and* makes them available in `mir::*`, like many other MIR types. r? `@tmandry`
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.