Implementing enforcing gas expectations in isoltest.

Co-authored-by: Daniel Kirchner <daniel@ekpyron.org>

test/tools/IsolTestOptions.cpp

@@ -76,6 +76,8 @@ bool IsolTestOptions::parse(int _argc, char const* const* _argv)
 		return false;
 	}
 	enforceViaYul = true;
+	enforceGasTest = (evmVersion() == langutil::EVMVersion{});
+	enforceGasTestMinValue = 100000;
 
 	return res;
 }