[Interpreter] Add dispatch counters for each bytecode.

src/interpreter/interpreter.cc

Index: src/interpreter/interpreter.cc
diff --git a/src/interpreter/interpreter.cc b/src/interpreter/interpreter.cc
index 28ff9d571cb464a7849bbfb3dfbe38b0e5a33fb5..1440302384ae73fd85c067b0c45667e836f1befa 100644
--- a/src/interpreter/interpreter.cc
+++ b/src/interpreter/interpreter.cc
@@ -32,6 +32,10 @@ void Interpreter::Initialize() {
   Zone zone;
   HandleScope scope(isolate_);
 
+  if (FLAG_ignition_count_handler_dispatches) {
+    memset(handlers_dispatch_counters_, 0, sizeof(handlers_dispatch_counters_));
+  }
+
   // Generate bytecode handlers for all bytecodes and scales.
   for (OperandScale operand_scale = OperandScale::kSingle;
        operand_scale <= OperandScale::kMaxValid;
@@ -154,7 +158,8 @@ bool Interpreter::MakeBytecode(CompilationInfo* info) {
 }
 
 bool Interpreter::IsDispatchTableInitialized() {
-  if (FLAG_trace_ignition || FLAG_trace_ignition_codegen) {
+  if (FLAG_trace_ignition || FLAG_trace_ignition_codegen ||
+      FLAG_ignition_count_handler_dispatches) {
     // Regenerate table to add bytecode tracing operations
     // or to print the assembly code generated by TurboFan.

[rmcilroy, 2016/04/05 10:00:46]

Please update this comment

[Stefano Sanfilippo, 2016/04/05 14:01:46]

Done.

     return false;