Revert "[dart] Fix core snapshot flags for Dart roll"

This reverts commit ab62b06866553be1a64098b07b2bd032ba6e1292.

Reason for revert: The Flutter roll went sideways, so this also has to be reverted.

Original change's description:
> [dart] Fix core snapshot flags for Dart roll
> 
> Change-Id: Ifd347856d6b690c69f589fdd68a36e46b4ddf459

TBR=pylaligand@google.com,zra@google.com,rmacnak@google.com,tamird@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I48977964134e1b86d0044af47e5770160e9f6449
diff --git a/runtime/dart_runner/kernel/BUILD.gn b/runtime/dart_runner/kernel/BUILD.gn
index a76ae1c..f1eddb5 100644
--- a/runtime/dart_runner/kernel/BUILD.gn
+++ b/runtime/dart_runner/kernel/BUILD.gn
@@ -63,10 +63,11 @@
     }
 
     args = [
+      # TODO(zra): remove this when the interpreter supports field guards.
+      "--no_use_field_guards",
       # TODO(FL-117): Re-enable causal async stack traces when this issue is
       # addressed.
       "--no_causal_async_stacks",
-
       "--use_bytecode_compiler",
       "--enable_mirrors=false",
       "--deterministic",
diff --git a/runtime/flutter_runner/kernel/BUILD.gn b/runtime/flutter_runner/kernel/BUILD.gn
index aef3295..85b7cfa 100644
--- a/runtime/flutter_runner/kernel/BUILD.gn
+++ b/runtime/flutter_runner/kernel/BUILD.gn
@@ -88,10 +88,12 @@
       script = gen_snapshot
     }
     args = [
+      # TODO(zra): remove this when the interpreter supports field guards.
+      "--no_use_field_guards",
+
       # TODO(FL-117): Re-enable causal async stack traces when this issue is
       # addressed.
       "--no_causal_async_stacks",
-
       "--use_bytecode_compiler",
       "--enable_mirrors=false",
       "--deterministic",