[SYCL][CUDA] libclc Image Support for CUDA (#1971)

Provides an implementation of image / sampling builtins required for CUDA backend image support.

Author: nyalloc

libclc/ptx-nvidiacl/libspirv/SOURCES

@@ -76,3 +76,5 @@ workitem/get_group_id.cl
 workitem/get_local_id.cl
 workitem/get_local_size.cl
 workitem/get_num_groups.cl
+images/image_helpers.ll
+images/image.cl