[PATCH] [AArch64] Implement pseudo LDR <reg>, =<literal/label>

[Weiming Zhao]

>>! In D4163#9, @dpeixott wrote:
> LGTM with a suitable commit message explaining why we want to split out the implementation.

Thanks for reviewing, David. I committed the refactoring part as r211198.

http://reviews.llvm.org/D4163