[jitless] Clarify flag incompatibility

The --jitless and --interpreted-frames-native-stack flags are
incompatible since the latter requires code generation while the
former prohibits code generation.

Bug: v8:9619
Change-Id: Ic954724edd6a2d28e1bf2f6a79649f86e812abcf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1758312
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63235}

src/init/v8.cc

@@ -90,6 +90,13 @@ void V8::InitializeOncePerProcessImpl() {
     FLAG_expose_wasm = false;
   }
 
+  // The --jitless and --interpreted-frames-native-stack flags are incompatible
+  // since the latter requires code generation while the former prohibits code
+  // generation.
+  CHECK_WITH_MSG(!FLAG_interpreted_frames_native_stack || !FLAG_jitless,
+                 "The --jitless and --interpreted-frames-native-stack flags "
+                 "are incompatible.");
+
   base::OS::Initialize(FLAG_hard_abort, FLAG_gc_fake_mmap);
 
   if (FLAG_random_seed) SetRandomMmapSeed(FLAG_random_seed);