Add dynamic_fn_ptr attribute to dynamic fn ptrs in M4A

Summary:
This list was generated using warnings logged to the console as part of D51514310. The warnings were then manually assessed as to whether they were true positives or false positives using either "dynamic_fn_ptr" or "ignore_dlsym" annotations.

I repeated this process and compiled M4A until there were no warnings logged to the console.

For files that touch open source or are just generally a pain to deal with, I left them ignorelisted as they really didn't seem to contain other function pointers we should be protecting.

Reviewed By: sampriti-fb

Differential Revision: D52634681

fbshipit-source-id: 73c3c84a44d1289a617d0721d8512854dc530848

cxx/lyra/cxa_throw.cpp

@@ -50,7 +50,7 @@ void enableCxaThrowHookBacktraces(bool enable) {
   enableBacktraces.store(enable, std::memory_order_relaxed);
 }
 
-[[gnu::noreturn]] void (
+[[gnu::noreturn]] __attribute__((annotate("dynamic_fn_ptr"))) void (
     *original_cxa_throw)(void*, const std::type_info*, void (*)(void*));
 
 #if defined(_LIBCPP_VERSION)