Do not report/abort when the reporter is disabled.

This is mainly to avoid reporting/aborting on `EXPECT_TRUE(test->RunIn...)`, which is unnecessary and time consuming (due to full stack trace printing).

PiperOrigin-RevId: 882585202

fuzztest/internal/centipede_adaptor.cc

diff --git a/fuzztest/internal/centipede_adaptor.cc b/fuzztest/internal/centipede_adaptor.cc
index ef874eb..71df38d 100644
--- a/fuzztest/internal/centipede_adaptor.cc
+++ b/fuzztest/internal/centipede_adaptor.cc
@@ -863,6 +863,11 @@
   runtime_.SetRunMode(mode);
   runtime_.SetSkippingRequested(false);
   runtime_.SetCurrentTest(&test_, &configuration);
+  // We don't always enable reporter, but always disable it at the end for
+  // simplicity.
+  absl::Cleanup always_disable_reporter = [this]() {
+    runtime_.DisableReporter();
+  };
   if (is_running_property_function_in_this_process) {
     if (IsSilenceTargetEnabled()) SilenceTargetStdoutAndStderr();
     // TODO(b/393582695): Consider whether we need some kind of reporting

fuzztest/internal/googletest_adaptor.h

diff --git a/fuzztest/internal/googletest_adaptor.h b/fuzztest/internal/googletest_adaptor.h
index 98e8a8a..190da2c 100644
--- a/fuzztest/internal/googletest_adaptor.h
+++ b/fuzztest/internal/googletest_adaptor.h
@@ -122,6 +122,7 @@
   void OnTestPartResult(const TestPartResult& test_part_result) override {
     if (!test_part_result.failed()) return;
     Runtime& runtime = Runtime::instance();
+    if (!runtime.reporter_enabled()) return;
     runtime.SetCrashTypeIfUnset("GoogleTest assertion failure");
     if (runtime.run_mode() == RunMode::kFuzz) {
       if (runtime.should_terminate_on_non_fatal_failure()) {

fuzztest/internal/runtime.h

diff --git a/fuzztest/internal/runtime.h b/fuzztest/internal/runtime.h
index bdefab5..ea867c3 100644
--- a/fuzztest/internal/runtime.h
+++ b/fuzztest/internal/runtime.h
@@ -175,6 +175,7 @@
     ResetCrashType();
   }
   void DisableReporter() { reporter_enabled_ = false; }
+  bool reporter_enabled() const { return reporter_enabled_; }
 
   struct Args {
     const GenericDomainCorpusType& corpus_value;