Rollup merge of #132574 - workingjubilee:abi-in-compiler, r=compiler-errors

compiler: Directly use rustc_abi almost everywhere

Use rustc_abi instead of rustc_target where applicable. This is mostly described by the following substitutions:
```rust
match path_substring {
    rustc_target::spec::abi::Abi => rustc_abi::ExternAbi,
    rustc_target::abi::call => rustc_target::callconv,
    rustc_target::abi => rustc_abi,
}
```

A number of spot-fixes make that not quite the whole story.

The main exception is in 33edc68 where I get a lot more persnickety about how things are imported, especially in `rustc_middle::ty::layout`, not just from where. This includes putting an end to a reexport of `rustc_middle::ty::ReprOptions`, for the same reason that the rest of this change is happening: reexports mostly confound things.

This notably omits rustc_passes and the ast crates, as I'm still examining a question I have about how they do stability checking of `extern "Abi"` strings and if I can simplify their logic. The rustc_abi and rustc_target crates also go untouched because they will be entangled in that cleanup.

r? compiler-errors

2 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_codegen_ssa/src/back/metadata.rs b/compiler/rustc_codegen_ssa/src/back/metadata.rs
index a7d95d56784..dad21bb309f 100644
--- a/compiler/rustc_codegen_ssa/src/back/metadata.rs
+++ b/compiler/rustc_codegen_ssa/src/back/metadata.rs
@@ -11,6 +11,7 @@ use object::{
     SectionFlags, SectionKind, SubArchitecture, SymbolFlags, SymbolKind, SymbolScope, elf, pe,
     xcoff,
 };
+use rustc_abi::Endian;
 use rustc_data_structures::memmap::Mmap;
 use rustc_data_structures::owned_slice::{OwnedSlice, try_slice_owned};
 use rustc_metadata::EncodedMetadata;
@@ -19,7 +20,6 @@ use rustc_metadata::fs::METADATA_FILENAME;
 use rustc_middle::bug;
 use rustc_session::Session;
 use rustc_span::sym;
-use rustc_target::abi::Endian;
 use rustc_target::spec::{RelocModel, Target, ef_avr_arch};
 
 use super::apple;
diff --git a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
index d9669453f5a..850d36872dd 100644
--- a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
+++ b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
@@ -548,7 +548,7 @@ pub(crate) fn linking_symbol_name_for_instance_in_crate<'tcx>(
     symbol: ExportedSymbol<'tcx>,
     instantiating_crate: CrateNum,
 ) -> String {
-    use rustc_target::abi::call::Conv;
+    use rustc_target::callconv::Conv;
 
     let mut undecorated = symbol_name_for_instance_in_crate(tcx, symbol, instantiating_crate);