Implement DynSend

Author: antoyo

compiler/rustc_codegen_gcc/src/lib.rs

@@ -93,6 +93,8 @@ use rustc_codegen_ssa::back::write::{CodegenContext, FatLtoInput, ModuleConfig,
 use rustc_codegen_ssa::back::lto::{LtoModuleCodegen, SerializedModule, ThinModule};
 use rustc_codegen_ssa::target_features::supported_target_features;
 use rustc_data_structures::fx::FxIndexMap;
+#[cfg(parallel_compiler)]
+use rustc_data_structures::sync::DynSend;
 use rustc_codegen_ssa::traits::{CodegenBackend, ExtraBackendMethods, ThinBufferMethods, WriteBackendMethods};
 use rustc_errors::{DiagnosticMessage, ErrorGuaranteed, Handler, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
@@ -143,6 +145,9 @@ pub struct LockedTargetInfo {
     info: Arc<Mutex<TargetInfo>>,
 }
 
+#[cfg(parallel_compiler)]
+unsafe impl DynSend for LockedTargetInfo {}
+
 impl LockedTargetInfo {
     fn cpu_supports(&self, feature: &str) -> bool {
         self.info.lock().expect("lock").cpu_supports(feature)