Try to delete dead calls instead of inlining them

Author: saethlin

compiler/rustc_mir_transform/src/lib.rs

@@ -555,6 +555,10 @@ fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
             &unreachable_prop::UnreachablePropagation,
             &uninhabited_enum_branching::UninhabitedEnumBranching,
             &o1(simplify::SimplifyCfg::new("after-uninhabited-enum-branching")),
+            &const_prop::ConstProp,
+            &const_debuginfo::ConstDebugInfo,
+            &o1(simplify_branches::SimplifyConstCondition::new("before-inline")),
+            &o1(simplify::SimplifyCfg::new("before-inline")),
             &inline::Inline,
             &remove_storage_markers::RemoveStorageMarkers,
             &remove_zsts::RemoveZsts,