[OpenCL] Add "cles_khr_int64" extension.

[Fznamznon]

Summary

For OpenCL 1.1 embedded profile 64 bit integers i.e. long,
ulong including the appropriate vector data types and operations
on 64-bit integers are optional. The "cles_khr_int64" extension
string will be reported if the embedded profile implementation
supports 64-bit integers.

[bader]

LGTM, but I'd like Anastasia to approve.
Thanks.

[Anastasia]

I am just a bit unclear about the use of this extension in the kernel language. Could you please clarify?

[Anastasia]

Oh I guess it can be used to exclude the code with long? LGTM!

cfe/trunk/include/clang/Basic/OpenCLExtensions.def

 OPENCLEXT_INTERNAL(cl_khr_int64_extended_atomics, 100, ~0U)
 OPENCLEXT_INTERNAL(cl_khr_gl_sharing, 100, ~0U)
 OPENCLEXT_INTERNAL(cl_khr_icd, 100, ~0U)
 
 // OpenCL 1.1.
 OPENCLEXT_INTERNAL(cl_khr_gl_event, 110, ~0U)
 OPENCLEXT_INTERNAL(cl_khr_d3d10_sharing, 110, ~0U)
 
+// EMBEDDED_PROFILE
+OPENCLEXT_INTERNAL(cles_khr_int64, 110, ~0U)
+
 // OpenCL 1.2.
 OPENCLEXT_INTERNAL(cl_khr_context_abort, 120, ~0U)
 OPENCLEXT_INTERNAL(cl_khr_d3d11_sharing, 120, ~0U)
 OPENCLEXT_INTERNAL(cl_khr_depth_images, 120, ~0U)
 OPENCLEXT_INTERNAL(cl_khr_dx9_media_sharing, 120, ~0U)
 OPENCLEXT_INTERNAL(cl_khr_image2d_from_buffer, 120, ~0U)
 OPENCLEXT_INTERNAL(cl_khr_initialize_memory, 120, ~0U)
 OPENCLEXT_INTERNAL(cl_khr_gl_depth_images, 120, ~0U)

cfe/trunk/test/SemaOpenCL/extension-version.cl

 #ifndef cl_khr_d3d10_sharing
 #error "Missing cl_khr_d3d10_sharing define"
 #endif
 #else
 // expected-warning@+2{{unsupported OpenCL extension 'cl_khr_d3d10_sharing' - ignoring}}
 #endif
 #pragma OPENCL EXTENSION cl_khr_d3d10_sharing: enable
 
+#if (__OPENCL_C_VERSION__ >= 110)
+#ifndef cles_khr_int64
+#error "Missing cles_khr_int64 define"
+#endif
+#else
+// expected-warning@+2{{unsupported OpenCL extension 'cles_khr_int64' - ignoring}}
+#endif
+#pragma OPENCL EXTENSION cles_khr_int64: enable
+
 #if (__OPENCL_C_VERSION__ >= 120)
 #ifndef cl_khr_context_abort
 #error "Missing cl_context_abort define"
 #endif
 #else
 // expected-warning@+2{{unsupported OpenCL extension 'cl_khr_context_abort' - ignoring}}
 #endif
 #pragma OPENCL EXTENSION cl_khr_context_abort: enable