amdgcn: Convert get_local_size to clc

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
Reviewed-By: Aaron Watry <awatry@gmail.com>
llvm-svn: 346079
GitOrigin-RevId: ea2f32b75d3eb9e36ce67fe4fc595413aac9d936
13 files changed