[PATCH] [ARM] Add v8.1a RDMA extension

[Vladimir Sukharev]

In the discussion on related feature in AArch64 backend (http://reviews.llvm.org/D7998), there were decisions taken:

- rename "rdma" subtarget feature to "v8_1a"
- not to introduce intrinsics, instead perform fusion "x = sqrdmlah(x.y.z)  --> x = sqadd(x, sqrdmulh(y.z)"

This way, this revision is invalid, I will upload next one soon.


http://reviews.llvm.org/D7999

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