deps: backport 2cd2f5feff3 from upstream v8

Original commit message:

    Remove experimental fast accessor builder API

    As the code isn't used, but would have to be ported from hand-written
    assembly to CodeStubAssembler anyways, I propose to remove it and
    restore it if we decide that we actually need it.

    R=vogelheim@chromium.org
    BUG=

    Change-Id: Iffd7fc6ec534b1dd7a9144da900424355c8a7a02
    Reviewed-on: https://chromium-review.googlesource.com/453461
    Commit-Queue: Jochen Eisinger <jochen@chromium.org>
    Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
    Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#43763}

Ref: v8/v8@2cd2f5feff3

PR-URL: #12875
Reviewed-By: James M Snell <jasnell@gmail.com>

deps/v8/BUILD.gn

@@ -887,7 +887,6 @@ v8_source_set("v8_base") {
 
     ### gcmole(all) ###
     "include/v8-debug.h",
-    "include/v8-experimental.h",
     "include/v8-platform.h",
     "include/v8-profiler.h",
     "include/v8-testing.h",
@@ -905,8 +904,6 @@ v8_source_set("v8_base") {
     "src/api-arguments-inl.h",
     "src/api-arguments.cc",
     "src/api-arguments.h",
-    "src/api-experimental.cc",
-    "src/api-experimental.h",
     "src/api-natives.cc",
     "src/api-natives.h",
     "src/api.cc",
@@ -1386,8 +1383,6 @@ v8_source_set("v8_base") {
     "src/external-reference-table.h",
     "src/factory.cc",
     "src/factory.h",
-    "src/fast-accessor-assembler.cc",
-    "src/fast-accessor-assembler.h",
     "src/fast-dtoa.cc",
     "src/fast-dtoa.h",
     "src/feedback-vector-inl.h",

deps/v8/include/v8.h

@@ -137,10 +137,6 @@ class CallHandlerHelper;
 class EscapableHandleScope;
 template<typename T> class ReturnValue;
 
-namespace experimental {
-class FastAccessorBuilder;
-}  // namespace experimental
-
 namespace internal {
 class Arguments;
 class Heap;
@@ -5098,16 +5094,6 @@ class V8_EXPORT FunctionTemplate : public Template {
   static MaybeLocal<FunctionTemplate> FromSnapshot(Isolate* isolate,
                                                    size_t index);
 
-  /**
-   * Creates a function template with a fast handler. If a fast handler is set,
-   * the callback cannot be null.
-   */
-  static Local<FunctionTemplate> NewWithFastHandler(
-      Isolate* isolate, FunctionCallback callback,
-      experimental::FastAccessorBuilder* fast_handler = nullptr,
-      Local<Value> data = Local<Value>(),
-      Local<Signature> signature = Local<Signature>(), int length = 0);
-
   /**
    * Creates a function template backed/cached by a private property.
    */
@@ -5135,9 +5121,8 @@ class V8_EXPORT FunctionTemplate : public Template {
    * callback is called whenever the function created from this
    * FunctionTemplate is called.
    */
-  void SetCallHandler(
-      FunctionCallback callback, Local<Value> data = Local<Value>(),
-      experimental::FastAccessorBuilder* fast_handler = nullptr);
+  void SetCallHandler(FunctionCallback callback,
+                      Local<Value> data = Local<Value>());
 
   /** Set the predefined length property for the FunctionTemplate. */
   void SetLength(int length);