Revert "Linux perf tool support update + refactoring." (r22118).

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 70353ee082edac199adbcf81049c6df5026c0198..15926671ab11be9cfa14d0fb0798f25f02eb795a 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1954,6 +1954,12 @@ 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_)),