added typetree support for memcpy

compiler/rustc_codegen_gcc/src/builder.rs

@@ -1383,6 +1383,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         _src_align: Align,
         size: RValue<'gcc>,
         flags: MemFlags,
+        _tt: Option<rustc_ast::expand::typetree::FncTree>, // Autodiff TypeTrees are LLVM-only, ignored in GCC backend
     ) {
         assert!(!flags.contains(MemFlags::NONTEMPORAL), "non-temporal memcpy not supported");
         let size = self.intcast(size, self.type_size_t(), false);

compiler/rustc_codegen_gcc/src/intrinsic/mod.rs

@@ -771,6 +771,7 @@ impl<'gcc, 'tcx> ArgAbiExt<'gcc, 'tcx> for ArgAbi<'tcx, Ty<'tcx>> {
                     scratch_align,
                     bx.const_usize(self.layout.size.bytes()),
                     MemFlags::empty(),
+                    None,
                 );
 
                 bx.lifetime_end(scratch, scratch_size);