[multi-return-fuzzer] Fix clusterfuzz issue in test

Change-Id: I20ee0d411155e23d87c731f0d909b14c55088c4c

R=ahaas@chromium.org
Also-By: ahaas@chromium.org

Bug: chromium:892435
Change-Id: I70ca2982ea0ddc39fecfbab983a7295707fe8873
Reviewed-on: https://chromium-review.googlesource.com/c/1264283Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56407}

test/fuzzer/multi-return.cc

@@ -241,8 +241,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   }
   callee.Return(static_cast<int>(desc->ReturnCount()), returns.get());
 
-  OptimizedCompilationInfo info(ArrayVector("testing"), &zone,
-                                Code::WASM_FUNCTION);
+  OptimizedCompilationInfo info(ArrayVector("testing"), &zone, Code::STUB);
   Handle<Code> code = Pipeline::GenerateCodeForTesting(
                           &info, i_isolate, desc, callee.graph(),
                           AssemblerOptions::Default(i_isolate), callee.Export())
@@ -286,7 +285,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
 
   // Call the wrapper.
   OptimizedCompilationInfo wrapper_info(ArrayVector("wrapper"), &zone,
-                                        Code::JS_TO_WASM_FUNCTION);
+                                        Code::STUB);
   Handle<Code> wrapper_code =
       Pipeline::GenerateCodeForTesting(
           &wrapper_info, i_isolate, wrapper_desc, caller.graph(),