Temporarily disable Split in fuzz_opt (#8575)

Until a fix for #8510 has landed.

Author: tlively

scripts/fuzz_opt.py

@@ -2301,7 +2301,7 @@ def handle(self, wasm):
     TrapsNeverHappen(),
     CtorEval(),
     Merge(),
-    Split(),
+    # Split(), # https://github.com/WebAssembly/binaryen/issues/8510
     RoundtripText(),
     ClusterFuzz(),
     Two(),