[OpenCL] Do not generate "kernel_arg_type_qual" metadata for non-pointer args
"kernel_arg_type_qual" metadata should contain const/volatile/restrict
tags only for pointer types to match the corresponding requirement of
the OpenCL specification.
OpenCL 2.0 spec 5.9.3 Kernel Object Queries:
CL_KERNEL_ARG_TYPE_VOLATILE is returned if the argument is a pointer
and the referenced type is declared with the volatile qualifier.
Similarly, CL_KERNEL_ARG_TYPE_CONST is returned if the argument is a
pointer and the referenced type is declared with the restrict or const
CL_KERNEL_ARG_TYPE_RESTRICT will be returned if the pointer type is
Reviewers: Anastasia, cfe-commits
Reviewed By: Anastasia
Subscribers: bader, yaxunl
Differential Revision: https://reviews.llvm.org/D31321