[turbofan] Don't abort inlining on first failed attempt.

Continue with the other candidates in case of a failed attempt to inline
a certain candidate.

TBR=mstarzinger@chromium.org
BUG=v8:4493
LOG=n

Review URL: https://codereview.chromium.org/1435373002

Cr-Commit-Position: refs/heads/master@{#31975}

src/compiler/js-inlining-heuristic.cc

@@ -101,12 +101,18 @@ void JSInliningHeuristic::Finalize() {
   // We inline at most one candidate in every iteration of the fixpoint.
   // This is to ensure that we don't consume the full inlining budget
   // on things that aren't called very often.
+  // TODO(bmeurer): Use std::priority_queue instead of std::set here.
+  while (!candidates_.empty()) {
     if (cumulative_count_ > FLAG_max_inlined_nodes_cumulative) return;
     auto i = candidates_.begin();
-  Candidate const& candidate = *i;
-  inliner_.ReduceJSCall(candidate.node, candidate.function);
-  cumulative_count_ += candidate.function->shared()->ast_node_count();
+    Candidate candidate = *i;
     candidates_.erase(i);
+    Reduction r = inliner_.ReduceJSCall(candidate.node, candidate.function);
+    if (r.Changed()) {
+      cumulative_count_ += candidate.function->shared()->ast_node_count();
+      return;
+    }
+  }
 }