[AArch64][TLSGD Desc][3/3] Implement TLS Global Dynamic Descriptor for tiny model

[Jiong Wang]

As we have generalized GD Descriptor support for all memory model in
the first patch.  Support for tiny model is quite straightforward. We
just need to output different instruction sequences according on memory
model.

OK for trunk?

2015-06-22  Jiong Wang  <jiong.wang@arm.com>

gcc/
  * config/aarch64/aarch64.md (tlsdesc_<mode>): Support tiny model
  constraint.
  
gcc/testsuite/
  * gcc.target/aarch64/tlsdesc_small.c: New.
  * gcc.target/aarch64/tlsdesc_tiny.c: Ditto.
  
-- 
Regards,
Jiong

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