[debugger] add precise mode for code coverage.

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 2883 matching lines @@
     DisallowHeapAllocation no_gc;
     Object* const initial_js_array_map =
         context()->native_context()->get(Context::ArrayMapIndex(kind));
     if (!initial_js_array_map->IsUndefined(this)) {
       return Map::cast(initial_js_array_map);
     }
   }
   return nullptr;
 }
 
-
-bool Isolate::use_crankshaft() const {
+bool Isolate::use_crankshaft() {
   return FLAG_opt && FLAG_crankshaft && !serializer_enabled_ &&
-         CpuFeatures::SupportsCrankshaft();
+         CpuFeatures::SupportsCrankshaft() && !IsCodeCoverageEnabled();
 }
 
 bool Isolate::NeedsSourcePositionsForProfiling() const {
   return FLAG_trace_deopt || FLAG_trace_turbo || FLAG_trace_turbo_graph ||
          FLAG_turbo_profiling || FLAG_perf_prof || is_profiling() ||
          debug_->is_active() || logger_->is_logging();
 }
 
+bool Isolate::IsCodeCoverageEnabled() {
+  return heap()->code_coverage_list()->IsArrayList();
+}
+
+void Isolate::SetCodeCoverageList(Object* value) {
+  DCHECK(value->IsUndefined(this) || value->IsArrayList());
+  heap()->set_code_coverage_list(value);
+}
+
 bool Isolate::IsArrayOrObjectPrototype(Object* object) {
   Object* context = heap()->native_contexts_list();
   while (!context->IsUndefined(this)) {
     Context* current_context = Context::cast(context);
     if (current_context->initial_object_prototype() == object ||
         current_context->initial_array_prototype() == object) {
       return true;
     }
     context = current_context->next_context_link();
   }
@@ skipping 723 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8