[turbofan] Greedy: smarter last resort splitting.

src/compiler/greedy-allocator.h

Index: src/compiler/greedy-allocator.h
diff --git a/src/compiler/greedy-allocator.h b/src/compiler/greedy-allocator.h
index b7398b38622a1a6855d2dc8935c059015fc264bc..45bbd87da894b9e9a300bbc95ea947ede4cde3e7 100644
--- a/src/compiler/greedy-allocator.h
+++ b/src/compiler/greedy-allocator.h
@@ -185,6 +185,10 @@ class GreedyAllocator final : public RegisterAllocator {
   // between spill ranges of group members.
   void TryReuseSpillRangesForGroups();
 
+  LifetimePosition GetLastResortSplitPosition(const LiveRange* range);
+
+  bool IsProgressPossible(const LiveRange* range);
+
   // Necessary heuristic: spill when all else failed.
   void SpillRangeAsLastResort(LiveRange* range);