Add a missing dereference

Author: TDecking

compiler-builtins/src/mem/x86_64.rs

@@ -23,7 +23,7 @@ use core::{intrinsics, mem};
 #[cfg(target_feature = "ermsb")]
 pub unsafe fn copy_forward(dest: *mut u8, src: *const u8, count: usize) {
     asm!(
-        "repe movsb [rdi], rsi",
+        "repe movsb [rdi], [rsi]",
         inout("rcx") count => _,
         inout("rdi") dest => _,
         inout("rsi") src => _,