[turbofan] Bring back early return in JSInliningHeuristic.

src/compiler/js-inlining-heuristic.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/js-inlining-heuristic.h"
 
 #include "src/compiler.h"
 #include "src/compiler/node-matchers.h"
 #include "src/objects-inl.h"
 
@@ skipping 71 matching lines @@
   // Everything above this line is part of the inlining heuristic.
   // ---------------------------------------------------------------------------
 
   // In the general case we remember the candidate for later.
   candidates_.insert({function, node, calls});
   return NoChange();
 }
 
 
 void JSInliningHeuristic::Finalize() {
+  if (candidates_.empty()) return;  // Nothing to do without candidates.
   if (FLAG_trace_turbo_inlining) PrintCandidates();
 
   while (!candidates_.empty()) {
     if (cumulative_count_ > FLAG_max_inlined_nodes_cumulative) break;
     auto i = candidates_.begin();
     Candidate const& candidate = *i;
     inliner_.ReduceJSCallFunction(candidate.node, candidate.function);
     cumulative_count_ += candidate.function->shared()->ast_node_count();
     candidates_.erase(i);
   }
@@ skipping 13 matching lines @@
            candidate.node->id(), candidate.calls,
            candidate.function->shared()->SourceSize(),
            candidate.function->shared()->ast_node_count(),
            candidate.function->shared()->DebugName()->ToCString().get());
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8