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[X86][IFMA] adding intrinsics and encoding for multiply and add of unsigned…

Authored by AsafBadouh on Jan 25 2016, 3:14 AM.

Description

[X86][IFMA] adding intrinsics and encoding for multiply and add of unsigned 52bit integer

VPMADD52LUQ - Packed Multiply of Unsigned 52-bit Integers and Add the Low 52-bit Products to Qword Accumulators
VPMADD52HUQ - Packed Multiply of Unsigned 52-bit Unsigned Integers and Add High 52-bit Products to 64-bit Accumulators

Differential Revision: http://reviews.llvm.org/D16407

llvm-svn: 258680