[PATCH] AArch64: Implement big endian bit-conversion for NEON types

[Christian Pirker]

Hi James,

LLVM converts 128 bit vector types into 2x64 bit types (and vice versa) for the sake of function argument passing.
That's the reason behind these bit conversions.
I don't see any benefit in handling other types of vector conversions.

Thanks,
Christian

http://reviews.llvm.org/D3424