[Interpreter] Add dispatch counters for each bytecode.

src/interpreter/interpreter-assembler.cc

Index: src/interpreter/interpreter-assembler.cc
diff --git a/src/interpreter/interpreter-assembler.cc b/src/interpreter/interpreter-assembler.cc
index 1cbe35d19925ffb2389bb3ec0fe15622a22f9c8f..2038b910017a0bd84444c0bd23e6a3700acd17c4 100644
--- a/src/interpreter/interpreter-assembler.cc
+++ b/src/interpreter/interpreter-assembler.cc
@@ -41,6 +41,9 @@ InterpreterAssembler::InterpreterAssembler(Isolate* isolate, Zone* zone,
   if (FLAG_trace_ignition) {
     TraceBytecode(Runtime::kInterpreterTraceBytecodeEntry);
   }
+  if (FLAG_ignition_count_handler_dispatches) {
+    IncrementDispatchCounter();
+  }
 }
 
 InterpreterAssembler::~InterpreterAssembler() {}
@@ -480,6 +483,33 @@ void InterpreterAssembler::InterpreterReturn() {
   DispatchToBytecodeHandler(exit_trampoline_code_object);
 }
 
+void InterpreterAssembler::IncrementDispatchCounter() {
+  Node* counters = ExternalConstant(
+      ExternalReference::interpreter_handlers_dispatch_counters(isolate()));
+  Node* counter_offset =
+      IntPtrConstant(static_cast<int>(bytecode_) * sizeof(uint32_t));
+  Node* old_counter = Load(MachineType::Uint32(), counters, counter_offset);
+  Node* new_counter = Int32Add(old_counter, Int32Constant(1));
+
+  if (FLAG_debug_code) {  // overflow checking on counters
+    CodeStubAssembler::Label after_overflow_detection(this);
+    CodeStubAssembler::Label overflow_detected(this);
+    CodeStubAssembler::Label end(this);
+
+    Node* new_counter_is_zero = Word32Equal(new_counter, Int32Constant(0));
+    Branch(new_counter_is_zero, &overflow_detected, &after_overflow_detection);
+    Bind(&overflow_detected);
+    Abort(BailoutReason::kInterpreterHandlersDispatchCounterOverflow);
+    Goto(&end);
+    Bind(&after_overflow_detection);
+    Goto(&end);
+    Bind(&end);
+  }
+
+  StoreNoWriteBarrier(MachineRepresentation::kWord32, counters, counter_offset,
+                      new_counter);
+}
+
 void InterpreterAssembler::StackCheck() {
   CodeStubAssembler::Label end(this);
   CodeStubAssembler::Label ok(this);