[fuzzer] Fix timeout in v8_script_parser_fuzzer due to unnecessary long inputs.

Bug: Chromium:841975
Change-Id: Ife77805fa3977dc874087ca7ae810eded2ae1c55
Reviewed-on: https://chromium-review.googlesource.com/1136986Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54468}

test/fuzzer/parser.cc

@@ -18,6 +18,11 @@
 #include "test/fuzzer/fuzzer-support.h"
 
 bool IsValidInput(const uint8_t* data, size_t size) {
+  // Ignore too long inputs as they tend to find OOM or timeouts, not real bugs.
+  if (size > 8192) {
+    return false;
+  }
+
   std::list<char> parentheses;
   const char* ptr = reinterpret_cast<const char*>(data);