[builtins] Introduce proper Float64Tan operator.

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 1407 matching lines @@
     "src/splay-tree.h",
     "src/startup-data-util.cc",
     "src/startup-data-util.h",
     "src/string-builder.cc",
     "src/string-builder.h",
     "src/string-search.h",
     "src/string-stream.cc",
     "src/string-stream.h",
     "src/strtod.cc",
     "src/strtod.h",
-    "src/third_party/fdlibm/fdlibm.cc",
-    "src/third_party/fdlibm/fdlibm.h",
     "src/tracing/trace-event.cc",
     "src/tracing/trace-event.h",
     "src/transitions-inl.h",
     "src/transitions.cc",
     "src/transitions.h",
     "src/type-cache.cc",
     "src/type-cache.h",
     "src/type-feedback-vector-inl.h",
     "src/type-feedback-vector.cc",
     "src/type-feedback-vector.h",
@@ skipping 576 matching lines @@
 #
 
 if (current_toolchain == v8_snapshot_toolchain) {
   v8_executable("mksnapshot") {
     visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
     sources = [
       "src/snapshot/mksnapshot.cc",
     ]
 
-    configs = [
-      ":internal_config",
-    ]
+    configs = [ ":internal_config" ]
 
     deps = [
       ":v8_base",
       ":v8_libplatform",
       ":v8_nosnapshot",
       "//build/config/sanitizers:deps",
       "//build/win:default_exe_manifest",
     ]
   }
 }
@@ skipping 35 matching lines @@
   v8_component("v8") {
     sources = [
       "src/v8dll-main.cc",
     ]
 
     public_deps = [
       ":v8_base",
       ":v8_maybe_snapshot",
     ]
 
-    configs = [
-      ":internal_config",
-    ]
+    configs = [ ":internal_config" ]
 
     public_configs = [ ":external_config" ]
   }
 } else {
   group("v8") {
     public_deps = [
       ":v8_base",
       ":v8_maybe_snapshot",
     ]
     public_configs = [ ":external_config" ]
@@ skipping 152 matching lines @@
 
   deps = [
     ":fuzzer_support",
   ]
 
   configs = [ ":internal_config" ]
 }
 
 v8_fuzzer("wasm_asmjs_fuzzer") {
 }