Remove more `Session` methods that duplicate `DiagCtxt` methods.

src/driver/aot.rs

@@ -108,7 +108,7 @@ impl OngoingCodegen {
 
         self.concurrency_limiter.finished();
 
-        sess.abort_if_errors();
+        sess.dcx().abort_if_errors();
 
         (
             CodegenResults {

src/driver/jit.rs

@@ -151,7 +151,7 @@ pub(crate) fn run_jit(tcx: TyCtxt<'_>, backend_config: BackendConfig) -> ! {
         tcx.dcx().fatal("Inline asm is not supported in JIT mode");
     }
 
-    tcx.sess.abort_if_errors();
+    tcx.dcx().abort_if_errors();
 
     jit_module.finalize_definitions().unwrap();
     unsafe { cx.unwind_context.register_jit(&jit_module) };
@@ -338,7 +338,7 @@ fn dep_symbol_lookup_fn(
             .collect::<Box<[_]>>(),
     );
 
-    sess.abort_if_errors();
+    sess.dcx().abort_if_errors();
 
     Box::new(move |sym_name| {
         for dylib in &*imported_dylibs {

src/lib.rs

@@ -204,7 +204,7 @@ impl CodegenBackend for CraneliftCodegenBackend {
         metadata: EncodedMetadata,
         need_metadata_module: bool,
     ) -> Box<dyn Any> {
-        tcx.sess.abort_if_errors();
+        tcx.dcx().abort_if_errors();
         let config = self.config.borrow().clone().unwrap();
         match config.codegen_mode {
             CodegenMode::Aot => driver::aot::run_aot(tcx, config, metadata, need_metadata_module),