fuzz: Speed up utxo_snapshot fuzz target

This speeds up the fuzz target, which allows "valid" inputs. It does not
affect the "INVALID" fuzz target.

Author: MarcoFalke

src/test/fuzz/utxo_snapshot.cpp

@@ -51,6 +51,7 @@ void initialize_chain()
                                            TestOpts{
                                                .setup_net = false,
                                                .setup_validation_interface = false,
+                                               .min_validation_cache = true,
                                            }),
     };
     if constexpr (INVALID) {

src/test/util/setup_common.cpp

@@ -244,16 +244,20 @@ ChainTestingSetup::ChainTestingSetup(const ChainType chainType, TestOpts opts)
 
     m_node.notifications = std::make_unique<KernelNotifications>(*Assert(m_node.shutdown), m_node.exit_status, *Assert(m_node.warnings));
 
-    m_make_chainman = [this, &chainparams] {
+    m_make_chainman = [this, &chainparams, opts] {
         Assert(!m_node.chainman);
-        const ChainstateManager::Options chainman_opts{
+        ChainstateManager::Options chainman_opts{
             .chainparams = chainparams,
             .datadir = m_args.GetDataDirNet(),
             .check_block_index = 1,
             .notifications = *m_node.notifications,
             .signals = m_node.validation_signals.get(),
             .worker_threads_num = 2,
         };
+        if (opts.min_validation_cache) {
+            chainman_opts.script_execution_cache_bytes = 0;
+            chainman_opts.signature_cache_bytes = 0;
+        }
         const BlockManager::Options blockman_opts{
             .chainparams = chainman_opts.chainparams,
             .blocks_dir = m_args.GetBlocksDirPath(),

src/test/util/setup_common.h

@@ -1,4 +1,4 @@
-// Copyright (c) 2015-2022 The Bitcoin Core developers
+// Copyright (c) 2015-present The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -55,6 +55,7 @@ struct TestOpts {
     bool block_tree_db_in_memory{true};
     bool setup_net{true};
     bool setup_validation_interface{true};
+    bool min_validation_cache{false}; // Equivalent of -maxsigcachebytes=0
 };
 
 /** Basic testing setup.