[turbofan] Break dependency on RegisterAllocationData from Merge.

src/compiler/register-allocator.h

Index: src/compiler/register-allocator.h
diff --git a/src/compiler/register-allocator.h b/src/compiler/register-allocator.h
index cffe54778ac33ae2e337edf58bc1e135bdc3093d..9346fa65adeb89aa780b983baf2635114990f223 100644
--- a/src/compiler/register-allocator.h
+++ b/src/compiler/register-allocator.h
@@ -471,7 +471,7 @@ class TopLevelLiveRange final : public LiveRange {
 
   // Assuming other was splintered from this range, embeds other and its
   // children as part of the children sequence of this range.
-  void Merge(TopLevelLiveRange* other, RegisterAllocationData* data);
+  void Merge(TopLevelLiveRange* other, Zone* zone);
 
   // Spill range management.
   void SetSpillRange(SpillRange* spill_range);