Revert "Rollup merge of #126938 - RalfJung:link_section, r=compiler-errors"

This reverts commit 5c4ede88c6, reversing
changes made to 95332b8918.

compiler/rustc_passes/src/reachable.rs

@@ -30,7 +30,7 @@ use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_hir::Node;
 use rustc_middle::bug;
-use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
+use rustc_middle::middle::codegen_fn_attrs::{CodegenFnAttrFlags, CodegenFnAttrs};
 use rustc_middle::middle::privacy::{self, Level};
 use rustc_middle::mir::interpret::{ConstAllocation, ErrorHandled, GlobalAlloc};
 use rustc_middle::query::Providers;
@@ -178,7 +178,15 @@ impl<'tcx> ReachableContext<'tcx> {
         if !self.any_library {
             // If we are building an executable, only explicitly extern
             // types need to be exported.
-            if has_custom_linkage(self.tcx, search_item) {
+            let codegen_attrs = if self.tcx.def_kind(search_item).has_codegen_attrs() {
+                self.tcx.codegen_fn_attrs(search_item)
+            } else {
+                CodegenFnAttrs::EMPTY
+            };
+            let is_extern = codegen_attrs.contains_extern_indicator();
+            let std_internal =
+                codegen_attrs.flags.contains(CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL);
+            if is_extern || std_internal {
                 self.reachable_symbols.insert(search_item);
             }
         } else {

src/tools/miri/tests/pass/tls/win_tls_callback.rs

@@ -1,16 +0,0 @@
-//! Ensure that we call Windows TLS callbacks in the local crate.
-//@only-target-windows
-// Calling eprintln in the callback seems to (re-)initialize some thread-local storage
-// and then leak the memory allocated for that. Let's just ignore these leaks,
-// that's not what this test is about.
-//@compile-flags: -Zmiri-ignore-leaks
-
-#[link_section = ".CRT$XLB"]
-#[used] // Miri only considers explicitly `#[used]` statics for `lookup_link_section`
-pub static CALLBACK: unsafe extern "system" fn(*const (), u32, *const ()) = tls_callback;
-
-unsafe extern "system" fn tls_callback(_h: *const (), _dw_reason: u32, _pv: *const ()) {
-    eprintln!("in tls_callback");
-}
-
-fn main() {}

src/tools/miri/tests/pass/tls/win_tls_callback.stderr

@@ -1 +0,0 @@
-in tls_callback