message: Use *_imm in some places
diff: @@ -68,8 +68,7 @@ fn codegen_field<'a, 'tcx: 'a>(
  let field_offset = layout.fields.offset(field.index());
  let field_ty = layout.field(&*fx, field.index());
  if field_offset.bytes() > 0 {
  - let field_offset = fx.bcx.ins().iconst(fx.module.pointer_type(), field_offset.bytes() as i64);
  - (fx.bcx.ins().iadd(base, field_offset), field_ty)
  + (fx.bcx.ins().iadd_imm(base, field_offset.bytes() as i64), field_ty)
  } else {
  (base, field_ty)
  }
  @@ -305,11 +304,7 @@ pub fn place_index(
  match layout.ty.sty {
  TypeVariants::TyArray(elem_ty, _) => {
  let elem_layout = fx.layout_of(elem_ty);
  - let size = fx
  - .bcx
  - .ins()
  - .iconst(fx.module.pointer_type(), elem_layout.size.bytes() as i64);
  - let offset = fx.bcx.ins().imul(size, index);
  + let offset = fx.bcx.ins().imul_imm(index, elem_layout.size.bytes() as i64);
  CPlace::Addr(fx.bcx.ins().iadd(addr, offset), elem_layout)
  }
  TypeVariants::TySlice(_elem_ty) => unimplemented!("place_index(TySlice)"),
  