[Committed][AArch64] Add support for :tlsdesc: and TLSDESC_ADR_PREL21

[Marcus Shawcroft]

This patch is the first of three that add support for tiny memory model 
TLSDESC.  This patch provides support for the :tlsdesc: address modifier 
on the ADR instruction along with the associated TLSDESC_ADR_PREL21 
relocation.

/Marcus
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