Remove support for specifying the number of available threads

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 <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
 
 #include "src/v8.h"
@@ skipping 2104 matching lines @@
 
   InitializeThreadLocal();
 
   bootstrapper_->Initialize(create_heap_objects);
   builtins_.SetUp(this, create_heap_objects);
 
   if (FLAG_log_internal_timer_events) {
     set_event_logger(Logger::DefaultEventLoggerSentinel);
   }
 
-  // Set default value if not yet set.
-  // TODO(yangguo): move this to ResourceConstraints::ConfigureDefaults
-  // once ResourceConstraints becomes an argument to the Isolate constructor.
-  if (max_available_threads_ < 1) {
-    // Choose the default between 1 and 4.
-    max_available_threads_ =
-        Max(Min(base::SysInfo::NumberOfProcessors(), 4), 1);
-  }
-
   if (FLAG_trace_hydrogen || FLAG_trace_hydrogen_stubs) {
     PrintF("Concurrent recompilation has been disabled for tracing.\n");
-  } else if (OptimizingCompileDispatcher::Enabled(max_available_threads_)) {
+  } else if (OptimizingCompileDispatcher::Enabled()) {
     optimizing_compile_dispatcher_ = new OptimizingCompileDispatcher(this);
   }
 
   // Initialize runtime profiler before deserialization, because collections may
   // occur, clearing/updating ICs.
   runtime_profiler_ = new RuntimeProfiler(this);
 
   // If we are deserializing, read the state into the now-empty heap.
   if (!create_heap_objects) {
     des->Deserialize(this);
@@ skipping 511 matching lines @@
   if (prev_ && prev_->Intercept(flag)) return true;
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 } }  // namespace v8::internal