[OpenCL] Add intel_reqd_sub_group_size attribute support
Summary:
Add intel_reqd_sub_group_size attribute support as intel extension cl_intel_required_subgroup_size from
https://www.khronos.org/registry/OpenCL/extensions/intel/cl_intel_required_subgroup_size.txt
Reviewers: Anastasia, bader, hfinkel, pxli168
Reviewed By: Anastasia, bader, pxli168
Subscribers: cfe-commits, yaxunl
Differential Revision: https://reviews.llvm.org/D30805
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@302125
91177308-0d34-0410-b5e6-
96231b3b80d8
projects / clang / commit