Add test case for omitting dllimport during cross-lang LTO.

Author: michaelwoerister

src/test/codegen/no-dllimport-w-cross-lang-lto.rs

@@ -0,0 +1,23 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// This test makes sure that functions get annotated with the proper
+// "target-cpu" attribute in LLVM.
+
+// no-prefer-dynamic
+// only-msvc
+// compile-flags: -C no-prepopulate-passes -Z cross-lang-lto
+
+#![crate_type = "rlib"]
+
+// CHECK-NOT: @{{.*}}__imp_{{.*}}GLOBAL{{.*}} = global i8*
+
+pub static GLOBAL: u32 = 0;
+pub static mut GLOBAL2: u32 = 0;