fuzz: Merge with -set_cover_merge=1

Author: MarcoFalke

test/fuzz/test_runner.py

@@ -276,7 +276,11 @@ def merge_inputs(*, fuzz_pool, corpus, test_list, src_dir, build_dir, merge_dir)
     for t in test_list:
         args = [
             os.path.join(build_dir, 'src', 'test', 'fuzz', 'fuzz'),
-            '-merge=1',
+            '-set_cover_merge=1',
+            # set_cover_merge is used instead of -merge=1 to reduce the overall
+            # size of the qa-assets git repository a bit, but more importantly,
+            # to cut the runtime to iterate over all fuzz inputs [0].
+            # [0] https://github.com/bitcoin-core/qa-assets/issues/130#issuecomment-1761760866
             '-shuffle=0',
             '-prefer_small=1',
             '-use_value_profile=0',