Fix coverage build for bytecode_builtins_list_generator

Use v8_executable instead of executable for
bytecode_builtins_list_generator so that coverage link flags should be
picked up too.

Bug: v8:8068
Change-Id: I260e4de3485a78d3b3a3455441837e1a5936aa25
Reviewed-on: https://chromium-review.googlesource.com/1219326Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55787}

BUILD.gn

@@ -3285,7 +3285,7 @@ if (v8_monolithic) {
 #
 
 if (current_toolchain == host_toolchain) {
-  executable("bytecode_builtins_list_generator") {
+  v8_executable("bytecode_builtins_list_generator") {
     visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
     include_dirs = [ "." ]
@@ -3302,6 +3302,8 @@ if (current_toolchain == host_toolchain) {
       defines = [ "V8_EMBEDDED_BUILTINS" ]
     }
 
+    configs = [ ":internal_config" ]
+
     deps = [
       ":v8_libbase",
       "//build/win:default_exe_manifest",