[wasm] Remove obsolete code modification scope.

R=clemensh@chromium.org

Change-Id: Iacfa93bdce7d8d175db9e606b7c667e4c967da51
Reviewed-on: https://chromium-review.googlesource.com/c/1335451Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57492}

src/wasm/wasm-debug.cc

@@ -617,9 +617,7 @@ void WasmDebugInfo::RedirectToInterpreter(Handle<WasmDebugInfo> debug_info,
       instance->module_object()->native_module();
   const wasm::WasmModule* module = instance->module();
 
-  // We may modify js wrappers, as well as wasm functions. Hence the 2
-  // modification scopes.
-  CodeSpaceMemoryModificationScope modification_scope(isolate->heap());
+  // We may modify the wasm jump table.
   wasm::NativeModuleModificationScope native_module_modification_scope(
       native_module);