[Intl] Use Intl::BoundFunctionContextSlot::kBoundFunction instead.

Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng;luci.chromium.try:linux_chromium_rel_ng

Bug: v8:7979
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: Ic390fbde6e04e86b8e284975c13c1eff8dc59e90
Reviewed-on: https://chromium-review.googlesource.com/1205411Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55622}

src/builtins/builtins-intl.cc

@@ -690,8 +690,8 @@ BUILTIN(NumberFormatInternalFormatNumber) {
   // 2. Assert: Type(nf) is Object and nf has an
   //    [[InitializedNumberFormat]] internal slot.
   Handle<JSNumberFormat> number_format = Handle<JSNumberFormat>(
-      JSNumberFormat::cast(
-          context->get(JSNumberFormat::ContextSlot::kNumberFormat)),
+      JSNumberFormat::cast(context->get(
+          static_cast<int>(Intl::BoundFunctionContextSlot::kBoundFunction))),
       isolate);
 
   // 3. If value is not provided, let value be undefined.

src/objects/js-number-format.h

@@ -107,16 +107,6 @@ class JSNumberFormat : public JSObject {
   DECL_ACCESSORS(bound_format, Object)
   DECL_INT_ACCESSORS(flags)
 
-  // ContextSlot defines the context structure for the bound
-  // NumberFormat.prototype.format function.
-  enum ContextSlot {
-    // The number format instance that the function holding this
-    // context is bound to.
-    kNumberFormat = Context::MIN_CONTEXT_SLOTS,
-
-    kLength
-  };
-
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSNumberFormat);
 };