[OpenCL] Disable __opencl_c_ext_fp64_* features if cl_khr_fp64 is not supported (#169252) Fix kernel build when cl_khr_fp64 is not enabled: opencl-c.h:13785:50: error: unknown type name 'atomic_double' 13785 | double __ovld atomic_fetch_min(volatile __global atomic_double *, double); opencl-c.h:13785:67: error: use of type 'double' requires cl_khr_fp64 and __opencl_c_fp64 support 13785 | double __ovld atomic_fetch_min(volatile __global atomic_double *, double); This is a regression introduced by 423bdb2b. Before that commit, __opencl_c_ext_fp64_global_atomic_add was guarded by cl_khr_fp64 in opencl-c-base.h.
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