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

1 files changed, 3 insertions, 3 deletions

diff --git a/compiler/rustc_codegen_llvm/src/abi.rs b/compiler/rustc_codegen_llvm/src/abi.rs
index 855ca010611..1d35138b013 100644
--- a/compiler/rustc_codegen_llvm/src/abi.rs
+++ b/compiler/rustc_codegen_llvm/src/abi.rs
@@ -2,6 +2,7 @@ use std::cmp;
 
 use libc::c_uint;
 use rustc_abi as abi;
+pub(crate) use rustc_abi::ExternAbi;
 use rustc_abi::Primitive::Int;
 use rustc_abi::{HasDataLayout, Size};
 use rustc_codegen_ssa::MemFlags;
@@ -13,9 +14,8 @@ use rustc_middle::ty::layout::LayoutOf;
 pub(crate) use rustc_middle::ty::layout::{WIDE_PTR_ADDR, WIDE_PTR_EXTRA};
 use rustc_middle::{bug, ty};
 use rustc_session::config;
-pub(crate) use rustc_target::abi::call::*;
+pub(crate) use rustc_target::callconv::*;
 use rustc_target::spec::SanitizerSet;
-pub(crate) use rustc_target::spec::abi::Abi;
 use smallvec::SmallVec;
 
 use crate::attributes::llfn_attrs_from_instance;
@@ -436,7 +436,7 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
             i - 1
         };
 
-        let apply_range_attr = |idx: AttributePlace, scalar: rustc_target::abi::Scalar| {
+        let apply_range_attr = |idx: AttributePlace, scalar: rustc_abi::Scalar| {
             if cx.sess().opts.optimize != config::OptLevel::No
                 && llvm_util::get_version() >= (19, 0, 0)
                 && matches!(scalar.primitive(), Int(..))