R600/SI: Lower 64-bit immediates using REG_SEQUENCE

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205561 91177308-0d34-0410-b5e6-96231b3b80d8
R600: Correct opcode for BFE_INT

Acording to AMD documentation, the correct opcode for
BFE_INT is 0x5, not 0x4

Fixes Arithm/Absdiff.Mat/3 OpenCV test

Patch by: Bruno Jiménez

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205562 91177308-0d34-0410-b5e6-96231b3b80d8