R600: Expand vector FSQRT ops

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193620 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Add compute support for CI v2

v2:
  - Fix LDS size calculation

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193621 91177308-0d34-0410-b5e6-96231b3b80d8