Rollup merge of #122166 - beetrees:remove-field-remapping, r=davidtwco

Remove the unused `field_remapping` field from `TypeLowering`

The `field_remapping` field of `TypeLowering` has  been unused since #121665. This PR removes it, then replaces the `TypeLowering` struct with its only remaining member `&'ll Type`.

1 files changed, 2 insertions, 11 deletions

diff --git a/compiler/rustc_codegen_llvm/src/context.rs b/compiler/rustc_codegen_llvm/src/context.rs
index 37c690a0128..f89c8c9f836 100644
--- a/compiler/rustc_codegen_llvm/src/context.rs
+++ b/compiler/rustc_codegen_llvm/src/context.rs
@@ -77,8 +77,8 @@ pub struct CodegenCx<'ll, 'tcx> {
     /// See <https://llvm.org/docs/LangRef.html#the-llvm-compiler-used-global-variable> for details
     pub compiler_used_statics: RefCell<Vec<&'ll Value>>,
 
-    /// Mapping of non-scalar types to llvm types and field remapping if needed.
-    pub type_lowering: RefCell<FxHashMap<(Ty<'tcx>, Option<VariantIdx>), TypeLowering<'ll>>>,
+    /// Mapping of non-scalar types to llvm types.
+    pub type_lowering: RefCell<FxHashMap<(Ty<'tcx>, Option<VariantIdx>), &'ll Type>>,
 
     /// Mapping of scalar types to llvm types.
     pub scalar_lltypes: RefCell<FxHashMap<Ty<'tcx>, &'ll Type>>,
@@ -105,15 +105,6 @@ pub struct CodegenCx<'ll, 'tcx> {
     pub renamed_statics: RefCell<FxHashMap<DefId, &'ll Value>>,
 }
 
-pub struct TypeLowering<'ll> {
-    /// Associated LLVM type
-    pub lltype: &'ll Type,
-
-    /// If padding is used the slice maps fields from source order
-    /// to llvm order.
-    pub field_remapping: Option<SmallVec<[u32; 4]>>,
-}
-
 fn to_llvm_tls_model(tls_model: TlsModel) -> llvm::ThreadLocalMode {
     match tls_model {
         TlsModel::GeneralDynamic => llvm::ThreadLocalMode::GeneralDynamic,