[PATCH] Fixing ARM64 warnings

[Aaron Ballman]

This patch is a conglomerate attempt to silence about MSVC 300
warnings in the new ARM64 backend. Since I don't usually work in the
backends, and some of this was relatively confusing code to begin
with, I figured I'd get a review on my attempted fixes.

ARM64AsmParser.cpp changes are especially questionable -- the return
type is bool, but it's returning an enumeration value which is
definitely not false. And in the case of
ARM64AsmParser::parseVectorList, the function never returns true.

Thanks!

~Aaron
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