message: Tell dynasm we are generating x64 code in `emitter_x64`.
diff: @@ -2,6 +2,13 @@ use dynasmrt::{x64::Assembler, AssemblyOffset, DynamicLabel, DynasmApi, DynasmLa
  use wasmer_runtime_core::backend::InlineBreakpointType;
  pub use wasmer_runtime_core::state::x64_decl::{GPR, XMM};
  +fn _dummy(_a: &Assembler) {
  + dynasm!(
  + _a
  + ; .arch x64
  + );
  +}
  +
  #[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
  pub enum Location {
  Imm8(u8),
  