This increases the chance to use "short" calls. Assumptions: - LLVM preserves the order of functions in a module - The wrapper function are smaller than the wrapped functions - The target CPU has "short" PC-relative variation of call/jmp instructions and they are preferrable over the "long" ones. A motivation: - To avoid some relocations for XIP, I want to use xtensa PC-relative call instructions, which can only reach ~512KB.