[PATCH][AArch64] Add more cfi annotations to tlsdesc entry points

[Szabolcs Nagy]

Backtrace through _dl_tlsdesc_resolve_rela was broken because the offset
of x30 from cfa was not in the debug info.

Add enough annotation so backtracing from the dynamic linker through
tlsdesc entry points works and the debugger shows registers correctly.

(manually tested with gdb.)

2016-12-09  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* sysdeps/aarch64/dl-tlsdesc.S (_dl_tlsdesc_dynamic): Add cfi
	annotation.
	(_dl_tlsdesc_resolve_rela, _dl_tlsdesc_resolve_hold): Likewise.
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