[turbofan] Remember source positions when creating graph from bytecode.

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 53582f73d7fbb2d6401f13dd754733b6b38248a9..c0a4a1e1b224ceb5cdd8fcbf3c72783ad73824ba 100644
--- a/src/compiler/bytecode-graph-builder.h
+++ b/src/compiler/bytecode-graph-builder.h
@@ -9,11 +9,13 @@
 #include "src/compiler/bytecode-loop-analysis.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/liveness-analyzer.h"
+#include "src/compiler/source-position.h"
 #include "src/compiler/state-values-utils.h"
 #include "src/compiler/type-hint-analyzer.h"
 #include "src/interpreter/bytecode-array-iterator.h"
 #include "src/interpreter/bytecode-flags.h"
 #include "src/interpreter/bytecodes.h"
+#include "src/source-position-table.h"
 
 namespace v8 {
 namespace internal {
@@ -27,7 +29,8 @@ namespace compiler {
 class BytecodeGraphBuilder {
  public:
   BytecodeGraphBuilder(Zone* local_zone, CompilationInfo* info,
-                       JSGraph* jsgraph, float invocation_frequency);
+                       JSGraph* jsgraph, float invocation_frequency,
+                       SourcePositionTable* source_positions);
 
   // Creates a graph by visiting bytecodes.
   bool CreateGraph();
@@ -301,6 +304,13 @@ class BytecodeGraphBuilder {
   // Analyzer of register liveness.
   LivenessAnalyzer liveness_analyzer_;
 
+  // The Turbofan source position table, to be populated.
+  SourcePositionTable* source_positions_;
+
+  // Update [source_positions_]'s current position to that of the bytecode at
+  // [offset], if any.
+  void UpdateCurrentSourcePosition(SourcePositionTableIterator* it, int offset);
+
   static int const kBinaryOperationHintIndex = 1;
   static int const kCountOperationHintIndex = 0;
   static int const kBinaryOperationSmiHintIndex = 2;