Make ExportedSymbols type more local because it's not supposed to be

used outside of the LLVM backend.

src/librustc_codegen_ssa/back/symbol_export.rs

@@ -17,8 +17,6 @@ use rustc_hir::Node;
 use rustc_index::vec::IndexVec;
 use syntax::expand::allocator::ALLOCATOR_METHODS;
 
-pub type ExportedSymbols = FxHashMap<CrateNum, Arc<Vec<(String, SymbolExportLevel)>>>;
-
 pub fn threshold(tcx: TyCtxt<'_>) -> SymbolExportLevel {
     crates_export_threshold(&tcx.sess.crate_types.borrow())
 }
@@ -96,7 +94,7 @@ fn reachable_non_generics_provider(
                     if !generics.requires_monomorphization(tcx) &&
                         // Functions marked with #[inline] are only ever codegened
                         // with "internal" linkage and are never exported.
-                        !Instance::mono(tcx, def_id).def.requires_local(tcx)
+                        !Instance::mono(tcx, def_id).def.generates_cgu_internal_copy(tcx)
                     {
                         Some(def_id)
                     } else {

src/librustc_codegen_ssa/back/write.rs

@@ -2,7 +2,8 @@ use super::command::Command;
 use super::link::{self, get_linker, remove};
 use super::linker::LinkerInfo;
 use super::lto::{self, SerializedModule};
-use super::symbol_export::{symbol_name_for_instance_in_crate, ExportedSymbols};
+use super::symbol_export::symbol_name_for_instance_in_crate;
+
 use crate::{
     CachedModuleCodegen, CodegenResults, CompiledModule, CrateInfo, ModuleCodegen, ModuleKind,
     RLIB_BYTECODE_EXTENSION,
@@ -12,6 +13,7 @@ use crate::traits::*;
 use jobserver::{Acquired, Client};
 use rustc::dep_graph::{WorkProduct, WorkProductFileKind, WorkProductId};
 use rustc::middle::cstore::EncodedMetadata;
+use rustc::middle::exported_symbols::SymbolExportLevel;
 use rustc::session::config::{
     self, Lto, OutputFilenames, OutputType, Passes, Sanitizer, SwitchWithOptPath,
 };
@@ -205,6 +207,8 @@ impl<B: WriteBackendMethods> Clone for TargetMachineFactory<B> {
     }
 }
 
+pub type ExportedSymbols = FxHashMap<CrateNum, Arc<Vec<(String, SymbolExportLevel)>>>;
+
 /// Additional resources used by optimize_and_codegen (not module specific)
 #[derive(Clone)]
 pub struct CodegenContext<B: WriteBackendMethods> {