[BUILD] Create compiler flag v8_enable_reverse_jsargs

The flag will be used to upload changes towards the removal of
arguments adaptor frame, by reversing the JS arguments in the stack.

Change-Id: Ia41f740d9fac51a072487733d387390e69574cfb
Bug: v8:10201
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2230525
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68176}

BUILD.gn

@@ -109,6 +109,9 @@ declare_args() {
   v8_enable_pointer_compression = ""
   v8_enable_31bit_smis_on_64bit_arch = false
 
+  # Reverse JS arguments order in the stack (sets -dV8_REVERSE_JSARGS).
+  v8_enable_reverse_jsargs = false
+
   # Sets -dOBJECT_PRINT.
   v8_enable_object_print = ""
 
@@ -444,6 +447,9 @@ config("v8_header_features") {
   if (v8_imminent_deprecation_warnings) {
     defines += [ "V8_IMMINENT_DEPRECATION_WARNINGS" ]
   }
+  if (v8_enable_reverse_jsargs) {
+    defines += [ "V8_REVERSE_JSARGS" ]
+  }
 }
 
 # Put defines here that are only used in our internal files and NEVER in