[turbofan] Simplified splintering code.

src/compiler/live-range-separator.h

Index: src/compiler/live-range-separator.h
diff --git a/src/compiler/live-range-separator.h b/src/compiler/live-range-separator.h
index c8e6edc20b341c4f514f2916b0b9c3fa1c4f9ad0..57bc98235dda6ac082aa940be0921659ef94d445 100644
--- a/src/compiler/live-range-separator.h
+++ b/src/compiler/live-range-separator.h
@@ -47,6 +47,11 @@ class LiveRangeMerger final : public ZoneObject {
   RegisterAllocationData* data() const { return data_; }
   Zone* zone() const { return zone_; }
 
+  // Mark ranges spilled in deferred blocks, that also cover non-deferred code.
+  // We do nothing special for ranges fully contained in deferred blocks,
+  // because they would "spill in deferred blocks" anyway.
+  void MarkRangesSpilledInDeferredBlocks();
+
   RegisterAllocationData* const data_;
   Zone* const zone_;