Enable embedded builtins on two bots

Since embedded builtins will be disabled by default until after the
M67 branch point, let's enable them on two specific bots to at least
have some continued coverage.

release_x64_internal is a release build (with an internal snapshot).
release_x64_verify_csa is a pseudo-debug build with DEBUG set.

Bug: v8:6666
Change-Id: I7e81c24e3cefc6eeba5d6e5823d47ab52f3e5941
Reviewed-on: https://chromium-review.googlesource.com/983597Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52274}

infra/mb/mb_config.pyl

@@ -415,7 +415,8 @@
     'release_x64_gcc_coverage': [
       'release_bot', 'x64', 'coverage', 'gcc'],
     'release_x64_internal': [
-      'release_bot', 'x64', 'v8_snapshot_internal'],
+      'release_bot', 'x64', 'v8_enable_embedded_builtins',
+      'v8_snapshot_internal'],
     'release_x64_jumbo': [
       'release_bot', 'x64', 'jumbo'],
     'release_x64_jumbo_trybot': [
@@ -445,7 +446,7 @@
       'release_bot', 'x64', 'ubsan_vptr', 'minimal_symbols'],
     'release_x64_verify_csa': [
       'release_bot', 'x64', 'dcheck_always_on',
-      'v8_enable_slow_dchecks', 'v8_verify_csa'],
+      'v8_enable_slow_dchecks', 'v8_enable_embedded_builtins', 'v8_verify_csa'],
 
     # Debug configs for x64.
     'debug_x64': [
@@ -752,6 +753,10 @@
       'gn_args': 'v8_enable_disassembler=true',
     },
 
+    'v8_enable_embedded_builtins': {
+      'gn_args': 'v8_enable_embedded_builtins=true',
+    },
+
     'v8_enable_slow_dchecks': {
       'gn_args': 'v8_enable_slow_dchecks=true',
     },