Reland "[Intl] remove unused js"

This is a reland of 2dc505a4

Original change's description:
> [Intl] remove unused js
> 
> Bug: v8:8066
> Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
> Change-Id: I9d86577540cf227e038354d9661c60fcdc644b3f
> Reviewed-on: https://chromium-review.googlesource.com/1179467
> Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
> Commit-Queue: Frank Tang <ftang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#55200}

Bug: v8:8066
Change-Id: Id1f63c2e9c855250a7af01c1e0877296c0320d20
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/1185762
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55415}

src/js/intl.js

@@ -26,7 +26,6 @@ var GlobalIntlNumberFormat = GlobalIntl.NumberFormat;
 var GlobalIntlCollator = GlobalIntl.Collator;
 var GlobalIntlPluralRules = GlobalIntl.PluralRules;
 var GlobalIntlv8BreakIterator = GlobalIntl.v8BreakIterator;
-var GlobalNumber = global.Number;
 var GlobalRegExp = global.RegExp;
 var GlobalString = global.String;
 var GlobalArray = global.Array;
@@ -39,7 +38,6 @@ var patternSymbol = utils.ImportNow("intl_pattern_symbol");
 var resolvedSymbol = utils.ImportNow("intl_resolved_symbol");
 var StringSubstr = GlobalString.prototype.substr;
 var StringSubstring = GlobalString.prototype.substring;
-var ArraySlice = GlobalArray.prototype.slice;
 
 utils.Import(function(from) {
   ArrayJoin = from.ArrayJoin;
@@ -48,18 +46,10 @@ utils.Import(function(from) {
 
 // Utilities for definitions
 
-macro IS_OBJECT(arg)
-(typeof(arg) === 'object')
-endmacro
-
 macro NUMBER_IS_NAN(arg)
 (%IS_VAR(arg) !== arg)
 endmacro
 
-macro NUMBER_IS_FINITE(arg)
-(%_IsSmi(%IS_VAR(arg)) || ((arg == arg) && (arg != 1/0) && (arg != -1/0)))
-endmacro
-
 // To avoid ES2015 Function name inference.
 
 macro ANONYMOUS_FUNCTION(fn)
@@ -524,17 +514,6 @@ function getAvailableLocalesOf(service) {
 }
 
 
-/**
- * Adds property to an object if the value is not undefined.
- * Sets configurable descriptor to false.
- */
-function addWEPropertyIfDefined(object, property, value) {
-  if (!IS_UNDEFINED(value)) {
-    %DefineWEProperty(object, property, value);
-  }
-}
-
-
 /**
  * Defines a property and sets writable, enumerable and configurable to true.
  */