Merge bitcoin/bitcoin#22755: fuzz: Avoid timeout in blockfilter fuzz target

fa2547f fuzz: Avoid timeout in blockfilter fuzz target (MarcoFalke)

Pull request description:

  Previously it would take 10 seconds to run this input, now it takes 10ms: [clusterfuzz-testcase-blockfilter-5022838196142080.log](https://github.com/bitcoin/bitcoin/files/7021883/clusterfuzz-testcase-blockfilter-5022838196142080.log)

  The fix is moving the `MatchAny` out of the hot loop.

  Also, to avoid unlimited runtime, cap the hot loop at 30k iterations.

ACKs for top commit:
  GeneFerneau:
    Approach ACK [fa2547f](bitcoin/bitcoin@fa2547f)

Tree-SHA512: a04e7388856930ec81222da8f05b665a923fe9482aeb4c55c9be4561aa7320a0703dbbf8d438ae92854e877a8e3b46777a29c0b652b8f34c29c2142cc5d63ccb

Author: MarcoFalke

src/test/fuzz/blockfilter.cpp

@@ -36,9 +36,10 @@ FUZZ_TARGET(blockfilter)
         (void)gcs_filter.GetEncoded();
         (void)gcs_filter.Match(ConsumeRandomLengthByteVector(fuzzed_data_provider));
         GCSFilter::ElementSet element_set;
-        while (fuzzed_data_provider.ConsumeBool()) {
+        LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 30000)
+        {
             element_set.insert(ConsumeRandomLengthByteVector(fuzzed_data_provider));
-            gcs_filter.MatchAny(element_set);
         }
+        gcs_filter.MatchAny(element_set);
     }
 }