common/bit_util: Replace CLZ/CTZ operations with standardized ones

Makes for less code that we need to maintain.

src/tests/CMakeLists.txt

@@ -1,6 +1,5 @@
 add_executable(tests
     common/bit_field.cpp
-    common/bit_utils.cpp
     common/fibers.cpp
     common/param_package.cpp
     common/ring_buffer.cpp