Machreg refactor#146

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pawosm-arm wants to merge 3 commits intoflang-compiler:masterfrom

pawosm-arm:machreg-refactor

Commits on Nov 3, 2018

machreg: architecture specific initializations
pawosm-arm
committed
machreg: in order to ease further arch specific improvements, remove unused functions
pawosm-arm
committed
machreg: AArch64 has 64-bit registers, no need to pack
pawosm-arm
committed