[multi-return] Restrict number of params and returns in the fuzzer

Apparently the fuzzer tries to create functions with more 130000
parameters, which is too much for TurboFan. For returns I use the
wasm limit because only wasm uses multiple returns.

R=clemensh@chromium.org

Bug: chromium:811070
Change-Id: Ib9a55439c1da8e82ef5f35ffb2e79cab8d4a9018
Reviewed-on: https://chromium-review.googlesource.com/913268Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51231}

test/fuzzer/multi-return.cc

@@ -17,6 +17,7 @@
 #include "src/objects-inl.h"
 #include "src/objects.h"
 #include "src/simulator.h"
+#include "src/wasm/wasm-limits.h"
 #include "src/zone/accounting-allocator.h"
 #include "src/zone/zone.h"
 #include "test/fuzzer/fuzzer-support.h"
@@ -227,7 +228,11 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   InputProvider input(data, size);
   // Create randomized descriptor.
   size_t param_count = input.NumNonZeroBytes(0, kNumTypes);
+  if (param_count > Code::kMaxArguments) return 0;
+
   size_t return_count = input.NumNonZeroBytes(param_count + 1, kNumTypes);
+  if (return_count > wasm::kV8MaxWasmFunctionMultiReturns) return 0;
+
   CallDescriptor* desc =
       CreateRandomCallDescriptor(&zone, return_count, param_count, &input);