Reland of [ignition/turbo] Perform liveness analysis on the bytecodes

src/compiler/bytecode-graph-builder.h

Index: src/compiler/bytecode-graph-builder.h
diff --git a/src/compiler/bytecode-graph-builder.h b/src/compiler/bytecode-graph-builder.h
index f26ab210e8ce259e930ae587cb85f8582bd0455a..1a39ee05f221e919fdfd487f9620e7faa1e170de 100644
--- a/src/compiler/bytecode-graph-builder.h
+++ b/src/compiler/bytecode-graph-builder.h
@@ -135,10 +135,6 @@ class BytecodeGraphBuilder {
   // Conceptually this frame state is "after" a given operation.
   void PrepareFrameState(Node* node, OutputFrameStateCombine combine);
 
-  // Computes register liveness and replaces dead ones in frame states with the
-  // undefined values.
-  void ClearNonLiveSlotsInFrameStates();
-
   void BuildCreateArguments(CreateArgumentsType type);
   Node* BuildLoadGlobal(Handle<Name> name, uint32_t feedback_slot_index,
                         TypeofMode typeof_mode);
@@ -260,8 +256,6 @@ class BytecodeGraphBuilder {
     bytecode_analysis_ = bytecode_analysis;
   }
 
-  LivenessAnalyzer* liveness_analyzer() { return &liveness_analyzer_; }
-
   bool IsLivenessAnalysisEnabled() const {
     return this->is_liveness_analysis_enabled_;
   }
@@ -307,9 +301,6 @@ class BytecodeGraphBuilder {
 
   StateValuesCache state_values_cache_;
 
-  // Analyzer of register liveness.
-  LivenessAnalyzer liveness_analyzer_;
-
   // The Turbofan source position table, to be populated.
   SourcePositionTable* source_positions_;