Rustup to rustc 1.31.0-nightly (155510e 2018-10-20) and fix test

Author: bjorn3

build.sh

@@ -24,7 +24,7 @@ build_example_bin() {
     $RUSTC $2 --crate-name $1 --crate-type bin
 
     pushd target/out
-    gcc libmini_core.rlib $1 -o $1_bin
+    gcc $1 libmini_core.rlib -o $1_bin
     sh -c ./$1_bin || true
     popd
 }

src/lib.rs

@@ -152,7 +152,7 @@ impl CodegenBackend for CraneliftCodegenBackend {
         providers.target_features_whitelist = |_tcx, _cnum| Lrc::new(Default::default());
         providers.is_reachable_non_generic = |_tcx, _defid| true;
         providers.exported_symbols = |_tcx, _crate| Arc::new(Vec::new());
-        providers.upstream_monomorphizations = |_tcx, _cnum| Lrc::new(FxHashMap());
+        providers.upstream_monomorphizations = |_tcx, _cnum| Lrc::new(FxHashMap::default());
         providers.upstream_monomorphizations_for = |tcx, def_id| {
             debug_assert!(!def_id.is_local());
             tcx.upstream_monomorphizations(LOCAL_CRATE)