rollup merge of #22177: semarie/openbsd-notls

OpenBSD doesn't have thread-local-storage support (yet).
Permit to compile (and run) `check-stage1-crates` under OpenBSD.

src/libstd/thread_local/scoped.rs

@@ -81,6 +81,7 @@ pub struct Key<T> { #[doc(hidden)] pub inner: __impl::KeyInner<T> }
         #[cfg_attr(not(any(windows,
                            target_os = "android",
                            target_os = "ios",
+                           target_os = "openbsd",
                            target_arch = "aarch64")),
                    thread_local)]
         static $name: ::std::thread_local::scoped::Key<$t> =
@@ -90,6 +91,7 @@ pub struct Key<T> { #[doc(hidden)] pub inner: __impl::KeyInner<T> }
         #[cfg_attr(not(any(windows,
                            target_os = "android",
                            target_os = "ios",
+                           target_os = "openbsd",
                            target_arch = "aarch64")),
                    thread_local)]
         pub static $name: ::std::thread_local::scoped::Key<$t> =
@@ -98,14 +100,22 @@ pub struct Key<T> { #[doc(hidden)] pub inner: __impl::KeyInner<T> }
     ($t:ty) => ({
         use std::thread_local::scoped::Key as __Key;
 
-        #[cfg(not(any(windows, target_os = "android", target_os = "ios", target_arch = "aarch64")))]
+        #[cfg(not(any(windows,
+                      target_os = "android",
+                      target_os = "ios",
+                      target_os = "openbsd",
+                      target_arch = "aarch64")))]
         const _INIT: __Key<$t> = __Key {
             inner: ::std::thread_local::scoped::__impl::KeyInner {
                 inner: ::std::cell::UnsafeCell { value: 0 as *mut _ },
             }
         };
 
-        #[cfg(any(windows, target_os = "android", target_os = "ios", target_arch = "aarch64"))]
+        #[cfg(any(windows,
+                  target_os = "android",
+                  target_os = "ios",
+                  target_os = "openbsd",
+                  target_arch = "aarch64"))]
         const _INIT: __Key<$t> = __Key {
             inner: ::std::thread_local::scoped::__impl::KeyInner {
                 inner: ::std::thread_local::scoped::__impl::OS_INIT,
@@ -205,7 +215,11 @@ pub fn is_set(&'static self) -> bool {
     }
 }
 
-#[cfg(not(any(windows, target_os = "android", target_os = "ios", target_arch = "aarch64")))]
+#[cfg(not(any(windows,
+              target_os = "android",
+              target_os = "ios",
+              target_os = "openbsd",
+              target_arch = "aarch64")))]
 mod imp {
     use std::cell::UnsafeCell;
 
@@ -223,7 +237,11 @@ pub unsafe fn get(&self) -> *mut T { *self.inner.get() }
     }
 }
 
-#[cfg(any(windows, target_os = "android", target_os = "ios", target_arch = "aarch64"))]
+#[cfg(any(windows,
+          target_os = "android",
+          target_os = "ios",
+          target_os = "openbsd",
+          target_arch = "aarch64"))]
 mod imp {
     use marker;
     use sys_common::thread_local::StaticKey as OsStaticKey;