[wasm] Remove unused enum marker

Just a cleanup to remove an unused enum marker.

R=ahaas@chromium.org

Change-Id: I7b40f2389796f43d82d06eb161569ecea7892ef6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2000145Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65753}

src/wasm/compilation-environment.h

@@ -92,11 +92,7 @@ class WireBytesStorage {
 enum class CompilationEvent : uint8_t {
   kFinishedBaselineCompilation,
   kFinishedTopTierCompilation,
-  kFailedCompilation,
-
-  // Marker:
-  // After an event >= kFirstFinalEvent, no further events are generated.
-  kFirstFinalEvent = kFinishedTopTierCompilation
+  kFailedCompilation
 };
 
 // The implementation of {CompilationState} lives in module-compiler.cc.