Concentrated header for internal bit utilities (#3721)

Co-authored-by: Stephan T. Lavavej <[email protected]>

Author: frederick-vs-ja

stl/CMakeLists.txt

@@ -7,6 +7,7 @@
 
 set(HEADERS
     ${CMAKE_CURRENT_LIST_DIR}/inc/__msvc_all_public_headers.hpp
+    ${CMAKE_CURRENT_LIST_DIR}/inc/__msvc_bit_utils.hpp
     ${CMAKE_CURRENT_LIST_DIR}/inc/__msvc_chrono.hpp
     ${CMAKE_CURRENT_LIST_DIR}/inc/__msvc_cxx_stdatomic.hpp
     ${CMAKE_CURRENT_LIST_DIR}/inc/__msvc_filebuf.hpp