cfi: Remove blacklist entries for libc++.
These functions have had no-CFI annotations in the source code for
a while now.
[cfi-unrelated-cast]
# The specification of std::get_temporary_buffer mandates a cast to
-# uninitialized T* (libstdc++, libc++, MSVC stdlib).
+# uninitialized T* (libstdc++, MSVC stdlib).
fun:_ZSt20get_temporary_buffer*
-fun:_ZNSt3__120get_temporary_buffer*
fun:*get_temporary_buffer@.*@std@@*
-# STL address-of magic (libstdc++, libc++).
+# STL address-of magic (libstdc++).
fun:*__addressof*
-fun:_ZNSt3__19addressof*
# Windows C++ stdlib headers that contain bad unrelated casts.
src:*xmemory0
