Reland "Linux perf tool support update + refactoring." (r22146, attempt #5)

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 "src/v8.h"
 
 #include "src/ast.h"
 #include "src/base/platform/platform.h"
@@ skipping 1926 matching lines @@
       (FLAG_log_code ||
        FLAG_ll_prof ||
        FLAG_perf_jit_prof ||
        FLAG_perf_basic_prof ||
        logger_->is_logging_code_events())) {
     HandleScope scope(this);
     LOG(this, LogCodeObjects());
     LOG(this, LogCompiledFunctions());
   }
 
-  // If we are profiling with the Linux perf tool, we need to disable
-  // code relocation.
-  if (FLAG_perf_jit_prof || FLAG_perf_basic_prof) {
-    FLAG_compact_code_space = false;
-  }
-
   CHECK_EQ(static_cast<int>(OFFSET_OF(Isolate, embedder_data_)),
            Internals::kIsolateEmbedderDataOffset);
   CHECK_EQ(static_cast<int>(OFFSET_OF(Isolate, heap_.roots_)),
            Internals::kIsolateRootsOffset);
   CHECK_EQ(static_cast<int>(
                OFFSET_OF(Isolate, heap_.amount_of_external_allocated_memory_)),
            Internals::kAmountOfExternalAllocatedMemoryOffset);
   CHECK_EQ(static_cast<int>(OFFSET_OF(
                Isolate,
                heap_.amount_of_external_allocated_memory_at_last_global_gc_)),
@@ skipping 400 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