Don't duplicate logic of when an Instance requests to be inlined.

src/librustc_trans_utils/common.rs

@@ -51,7 +51,8 @@ pub fn requests_inline<'a, 'tcx>(
         // available to normal end-users.
         return true
     }
-    attr::requests_inline(&instance.def.attrs(tcx)[..])
+    attr::requests_inline(&instance.def.attrs(tcx)[..]) ||
+        tcx.is_const_fn(instance.def.def_id())
 }
 
 pub fn is_inline_instance<'a, 'tcx>(

src/librustc_trans_utils/lib.rs

@@ -40,14 +40,12 @@ extern crate rustc_data_structures;
 extern crate syntax;
 extern crate syntax_pos;
 
-use rustc::ty::TyCtxt;
+use rustc::ty::{TyCtxt, Instance};
 use rustc::hir;
 use rustc::hir::def_id::LOCAL_CRATE;
 use rustc::hir::map as hir_map;
 use rustc::util::nodemap::NodeSet;
 
-use syntax::attr;
-
 pub mod common;
 pub mod link;
 pub mod collector;
@@ -77,7 +75,7 @@ pub fn check_for_rustc_errors_attr(tcx: TyCtxt) {
 ///
 /// This list is later used by linkers to determine the set of symbols needed to
 /// be exposed from a dynamic library and it's also encoded into the metadata.
-pub fn find_exported_symbols(tcx: TyCtxt) -> NodeSet {
+pub fn find_exported_symbols<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> NodeSet {
     tcx.reachable_set(LOCAL_CRATE).0.iter().cloned().filter(|&id| {
         // Next, we want to ignore some FFI functions that are not exposed from
         // this crate. Reachable FFI functions can be lumped into two
@@ -110,8 +108,7 @@ pub fn find_exported_symbols(tcx: TyCtxt) -> NodeSet {
                 (generics.parent_types == 0 && generics.types.is_empty()) &&
                 // Functions marked with #[inline] are only ever translated
                 // with "internal" linkage and are never exported.
-                !attr::requests_inline(&tcx.get_attrs(def_id)) &&
-                !tcx.is_const_fn(def_id)
+                !common::requests_inline(tcx, &Instance::mono(tcx, def_id))
             }
 
             _ => false