[Interpreter] Add option to trace bytecode execution.

src/compiler/interpreter-assembler.h

Index: src/compiler/interpreter-assembler.h
diff --git a/src/compiler/interpreter-assembler.h b/src/compiler/interpreter-assembler.h
index fb79d3eaa2ff2a506faf3cb3cbd2e6f91b767b74..5e40a071aecd74c51ad154dffa71129c168c6e5d 100644
--- a/src/compiler/interpreter-assembler.h
+++ b/src/compiler/interpreter-assembler.h
@@ -138,6 +138,8 @@ class InterpreterAssembler {
   Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1);
   Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1, Node* arg2);
   Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1, Node* arg2,
+                    Node* arg3);
+  Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1, Node* arg2,
                     Node* arg3, Node* arg4);
 
   // Jump relative to the current bytecode by |jump_offset|.
@@ -178,6 +180,9 @@ class InterpreterAssembler {
   void CallPrologue();
   void CallEpilogue();

[Michael Starzinger, 2016/01/28 12:32:26]

nit: Also the declaration of CallEpilogue can be dropped and the comment above
adapted now.

[rmcilroy, 2016/01/28 16:39:51]

Done.

 
+  // Traces the current bytecode by calling |function_id|.
+  void TraceBytecode(Runtime::FunctionId function_id);
+
   // Returns the offset of register |index| relative to RegisterFilePointer().
   Node* RegisterFrameOffset(Node* index);