[wasm][pku] Fix check for write protection

As the comment notes, we want to ensure that code space is *not*
writable by the current thread.

R=jkummerow@chromium.org
CC=mpdenton@chromium.org

Bug: v8:11974
Change-Id: I5c3cad32b8edc56013f298405c8e20d8bc9da05f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3173675Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76985}

src/execution/execution.cc

@@ -257,7 +257,7 @@ V8_WARN_UNUSED_RESULT MaybeHandle<Object> Invoke(Isolate* isolate,
   // If we have PKU support for Wasm, ensure that code is currently write
   // protected for this thread.
   DCHECK_IMPLIES(wasm::GetWasmCodeManager()->HasMemoryProtectionKeySupport(),
-                 wasm::GetWasmCodeManager()->MemoryProtectionKeyWritable());
+                 !wasm::GetWasmCodeManager()->MemoryProtectionKeyWritable());
 #endif  // V8_ENABLE_WEBASSEMBLY
 
 #ifdef USE_SIMULATOR