Reland "Linux perf tool support update + refactoring."

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # TODO(jochen): These will need to be user-settable to support standalone V8
 # builds.
 v8_compress_startup_data = "off"
 v8_deprecation_warnings = false
 v8_enable_disassembler = false
 v8_enable_gdbjit = false
@@ skipping 660 matching lines @@
     "src/objects-visiting.cc",
     "src/objects-visiting.h",
     "src/objects.cc",
     "src/objects.h",
     "src/optimizing-compiler-thread.cc",
     "src/optimizing-compiler-thread.h",
     "src/ostreams.cc",
     "src/ostreams.h",
     "src/parser.cc",
     "src/parser.h",
+    "src/perf-jit.cc",
+    "src/perf-jit.h",
     "src/preparse-data-format.h",
     "src/preparse-data.cc",
     "src/preparse-data.h",
     "src/preparser.cc",
     "src/preparser.h",
     "src/prettyprinter.cc",
     "src/prettyprinter.h",
     "src/profile-generator-inl.h",
     "src/profile-generator.cc",
     "src/profile-generator.h",
@@ skipping 469 matching lines @@
     deps = [
       ":v8_base",
       ":v8_nosnapshot",
     ]
   }
 
   direct_dependent_configs = [ ":external_config" ]
 }
 
 }