Fix cross-crate inlining of intrinsics

Author: brson

src/rustc/middle/trans/base.rs

@@ -2504,11 +2504,39 @@ fn lval_static_fn_inner(bcx: block, fn_id: ast::def_id, id: ast::node_id,
 
     // Check whether this fn has an inlined copy and, if so, redirect fn_id to
     // the local id of the inlined copy.
+    let original_crate = fn_id.crate;
     let fn_id = if fn_id.crate != ast::local_crate {
         maybe_instantiate_inline(ccx, fn_id)
     } else { fn_id };
 
-    if fn_id.crate == ast::local_crate && tys.len() > 0u {
+    let must_monomorphise = {
+        let local_with_type_params =
+            fn_id.crate == ast::local_crate && tys.len() > 0u;
+
+        // Rust intrinsic functions should always be monomorphised
+        let inlined_rust_intrinsic = {
+            if fn_id.crate == ast::local_crate
+                && original_crate != ast::local_crate {
+
+                let map_node = session::expect(
+                    ccx.sess,
+                    ccx.tcx.items.find(fn_id.node),
+                    || fmt!("inlined item should be in ast map"));
+
+                match map_node {
+                  ast_map::node_foreign_item(
+                      _, ast::foreign_abi_rust_intrinsic, _) => true,
+                  _ => false
+                }
+            } else {
+                false
+            }
+        };
+
+        local_with_type_params || inlined_rust_intrinsic
+    };
+
+    if must_monomorphise {
         let mut {val, must_cast} =
             monomorphic_fn(ccx, fn_id, tys, vtables, Some(id));
         if must_cast {

src/test/run-pass/intrinsic-atomics-cc.rs

@@ -1,8 +1,6 @@
 // xfail-fast - check-fast doesn't understand aux-build
 // aux-build:cci_intrinsic.rs
 
-// xfail-test
-
 use cci_intrinsic;
 import cci_intrinsic::atomic_xchg;