[wasm] Check for WasmExportedFunction before cast

{WasmInternalFunction::external} might return a function that is not
a WasmExportedFunction, at which point the code in ProcessTypeFeedback
fails.

See crrev.com/c/3277878 for context.

Bug: v8:12436
Change-Id: I447710cfa2dbdb64cba27922da85871d18bc79a3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3303613Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78126}

src/wasm/module-compiler.cc

@@ -1253,7 +1253,9 @@ std::vector<CallSiteFeedback> ProcessTypeFeedback(
       static_cast<int>(instance->module()->num_imported_functions);
   for (int i = 0; i < feedback.length(); i += 2) {
     Object value = feedback.get(i);
-    if (value.IsWasmInternalFunction()) {
+    if (value.IsWasmInternalFunction() &&
+        WasmExportedFunction::IsWasmExportedFunction(
+            WasmInternalFunction::cast(value).external())) {
       // Monomorphic. Mark the target for inlining if it's defined in the
       // same module.
       WasmExportedFunction target = WasmExportedFunction::cast(