Auto merge of rust-lang#126650 - compiler-errors:renames, r=lcnr

Rename a bunch of things in the new solver and `rustc_type_ir`

* Renames `interner()` to `cx()` in the solver and `TypeFolder`.
* Renames `Infcx` generic param to `D`
* Moves `infcx.rs` to `delegate.rs`

r? lcnr

Author: bors

compiler/rustc_middle/src/ty/normalize_erasing_regions.rs

@@ -173,7 +173,7 @@ impl<'tcx> NormalizeAfterErasingRegionsFolder<'tcx> {
 }
 
 impl<'tcx> TypeFolder<TyCtxt<'tcx>> for NormalizeAfterErasingRegionsFolder<'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 
@@ -211,7 +211,7 @@ impl<'tcx> TryNormalizeAfterErasingRegionsFolder<'tcx> {
 impl<'tcx> FallibleTypeFolder<TyCtxt<'tcx>> for TryNormalizeAfterErasingRegionsFolder<'tcx> {
     type Error = NormalizationError<'tcx>;
 
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 

compiler/rustc_middle/src/ty/opaque_types.rs

@@ -95,7 +95,7 @@ impl<'tcx> ReverseMapper<'tcx> {
 }
 
 impl<'tcx> TypeFolder<TyCtxt<'tcx>> for ReverseMapper<'tcx> {
-    fn interner(&self) -> TyCtxt<'tcx> {
+    fn cx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 
@@ -144,7 +144,7 @@ impl<'tcx> TypeFolder<TyCtxt<'tcx>> for ReverseMapper<'tcx> {
                     )
                     .emit();
 
-                ty::Region::new_error(self.interner(), e)
+                ty::Region::new_error(self.cx(), e)
             }
         }
     }