[builtins] Introduce proper base::ieee754::log.

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.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/dcheck_always_on.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
@@ skipping 1880 matching lines @@
     "src/base/cpu.h",
     "src/base/division-by-constant.cc",
     "src/base/division-by-constant.h",
     "src/base/file-utils.cc",
     "src/base/file-utils.h",
     "src/base/flags.h",
     "src/base/format-macros.h",
     "src/base/functional.cc",
     "src/base/functional.h",
     "src/base/hashmap.h",
+    "src/base/ieee754.cc",
+    "src/base/ieee754.h",
     "src/base/iterator.h",
     "src/base/lazy-instance.h",
     "src/base/logging.cc",
     "src/base/logging.h",
     "src/base/macros.h",
     "src/base/once.cc",
     "src/base/once.h",
     "src/base/platform/condition-variable.cc",
     "src/base/platform/condition-variable.h",
     "src/base/platform/elapsed-timer.h",
@@ skipping 380 matching lines @@
 
   deps = [
     ":fuzzer_support",
   ]
 
   configs = [ ":internal_config" ]
 }
 
 v8_fuzzer("wasm_asmjs_fuzzer") {
 }