[llvm-commits] ARM EABI memset

[Renato Golin]

RTABI chapter 4.3.4 specifies __eabi_mem* calls. Specifically,
__eabi_memset accepts parameters (ptr, size, value) in a different
order than GNU's memset (ptr, value, size), therefore the special
lowering in AAPCS mode.

This patch includes the lib call naming, specially lowering when in
EABI mode and additional test to make sure we get the right behaviour
on both modes.

Please, let me know if it's good, so I can commit.

cheers,
--renato
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