[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 53c610a218758476fedd80d8c59471ca19d9d926..32955a1bdad223b0726b43c4e224c06bc8c15942 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_));
+  }
+
 #define GENERATE_CODE(Name, ...)                                        \
   {                                                                     \
     InterpreterAssembler assembler(isolate_, &zone, Bytecode::k##Name); \
@@ -111,7 +115,7 @@ bool Interpreter::MakeBytecode(CompilationInfo* info) {
 }
 
 bool Interpreter::IsDispatchTableInitialized() {
-  if (FLAG_trace_ignition) {
+  if (FLAG_trace_ignition || FLAG_ignition_count_handler_dispatches) {
     // Regenerate table to add bytecode tracing operations.
     return false;
   }