This series, which depends on the previous two, introduces static_call(). static_call(), is the idea of static_branch() applied to indirect function calls. Remove a data load (indirection) by modifying the text.
These patches are still based on the work Josh did earlier, but incorporated feedback from the last posting and have a lot of extra patches which resulted from me trying to actually use static_call(). This still relies on objtool to generate the .static_call_sites section, mostly because this is a natural place for x86_64 and works for both GCC and LLVM. Other architectures can pick other means if/when they implement the inline patching. The out-of-line (aka. trampoline) variant doesn't require this.
