test: Pass bench exe into test framework utils

This teaches the test framework about the bench executable, which is
required for the next commit.

test/functional/test_framework/test_framework.py

@@ -943,6 +943,11 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
         if not self.is_bitcoin_chainstate_compiled():
             raise SkipTest("bitcoin-chainstate has not been compiled")
 
+    def skip_if_no_bitcoin_bench(self):
+        """Skip the running test if bench_bitcoin has not been compiled."""
+        if not self.is_bench_compiled():
+            raise SkipTest("bench_bitcoin has not been compiled")
+
     def skip_if_no_cli(self):
         """Skip the running test if bitcoin-cli has not been compiled."""
         if not self.is_cli_compiled():
@@ -976,6 +981,10 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
         if self.options.valgrind:
             raise SkipTest("This test is not compatible with Valgrind.")
 
+    def is_bench_compiled(self):
+        """Checks whether bench_bitcoin was compiled."""
+        return self.config["components"].getboolean("BUILD_BENCH")
+
     def is_cli_compiled(self):
         """Checks whether bitcoin-cli was compiled."""
         return self.config["components"].getboolean("ENABLE_CLI")