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

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 8f2fa4aa098ff373b19e013d29c8c9147d98afb9..ef05c1ab7cb374ec8ca5a0c781bff17cfed4297b 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1944,12 +1944,6 @@ bool Isolate::Init(Deserializer* des) {
     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_)),