[PATCH][AArch64]Implement newly added AArch64 ACLE functions for ld1 and st1

[Hao Liu]

Hi Tim and reviewers,

 

The new ACLE document has added many functions about ld1/st1 with 2/3/4
vectors. Such as 

       "void vst1_s8_x2(int8_t * ptr, int8x8x2_t val)". 

I've implemented them and matched them to the corresponding instructions in
the backend.

The patches are in attachment and are showed at
http://llvm-reviews.chandlerc.com/D2175.

 

Review, please.

 

Thanks,

-Hao
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