[BUILD] Disable warning for using enum constant in boolean context

Change-Id: I5e976ba8cbecaff04a0975a3de00627cabb00f3f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2442432Reviewed-by: Milad Fa <mfarazma@redhat.com>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#70284}

BUILD.gn

@@ -942,6 +942,10 @@ config("toolchain") {
       # GCC assumes that control can get past an exhaustive switch and then
       # warns if there's no return there (see https://crbug.com/v8/7658).
       "-Wno-return-type",
+
+      # Disable gcc warnings for using enum constant in boolean context.
+      # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97266
+      "-Wno-int-in-bool-context",
     ]
   }