Auto merge of #136965 - jhpratt:rollup-bsnqvmf, r=jhpratt

Rollup of 8 pull requests

Successful merges:

 - #134999 (Add cygwin target.)
 - #136559 (Resolve named regions when reporting type test failures in NLL)
 - #136660 (Use a trait to enforce field validity for union fields + `unsafe` fields + `unsafe<>` binder types)
 - #136858 (Parallel-compiler-related cleanup)
 - #136881 (cg_llvm: Reduce visibility of all functions in the llvm module)
 - #136888 (Always perform discr read for never pattern in EUV)
 - #136948 (Split out the `extern_system_varargs` feature)
 - #136949 (Fix import in bench for wasm)

r? `@ghost`
`@rustbot` modify labels: rollup

2 files changed, 3 insertions, 4 deletions

diff --git a/compiler/rustc_codegen_gcc/example/mini_core.rs b/compiler/rustc_codegen_gcc/example/mini_core.rs
index 5a4ee0a198c..2ff1d757fd4 100644
--- a/compiler/rustc_codegen_gcc/example/mini_core.rs
+++ b/compiler/rustc_codegen_gcc/example/mini_core.rs
@@ -54,6 +54,9 @@ impl<T: ?Sized, A: Allocator> LegacyReceiver for Box<T, A> {}
 #[lang = "copy"]
 pub trait Copy {}
 
+#[lang = "bikeshed_guaranteed_no_drop"]
+pub trait BikeshedGuaranteedNoDrop {}
+
 impl Copy for bool {}
 impl Copy for u8 {}
 impl Copy for u16 {}
diff --git a/compiler/rustc_codegen_gcc/src/back/lto.rs b/compiler/rustc_codegen_gcc/src/back/lto.rs
index e419bd18099..cb4caec8c32 100644
--- a/compiler/rustc_codegen_gcc/src/back/lto.rs
+++ b/compiler/rustc_codegen_gcc/src/back/lto.rs
@@ -710,10 +710,6 @@ pub struct ThinBuffer {
     context: Arc<SyncContext>,
 }
 
-// TODO: check if this makes sense to make ThinBuffer Send and Sync.
-unsafe impl Send for ThinBuffer {}
-unsafe impl Sync for ThinBuffer {}
-
 impl ThinBuffer {
     pub(crate) fn new(context: &Arc<SyncContext>) -> Self {
         Self { context: Arc::clone(context) }