Make the buffer RW as Level Zero supports only RW buffers

Author: dm-vodopyanov

sycl/include/CL/sycl/detail/pi.h

@@ -515,7 +515,6 @@ typedef enum {
 using pi_mem_flags = pi_bitfield;
 // Access
 constexpr pi_mem_flags PI_MEM_FLAGS_ACCESS_RW = CL_MEM_READ_WRITE;
-constexpr pi_mem_flags PI_MEM_FLAGS_ACCESS_RO = CL_MEM_READ_ONLY;
 // Host pointer
 constexpr pi_mem_flags PI_MEM_FLAGS_HOST_PTR_USE = CL_MEM_USE_HOST_PTR;
 constexpr pi_mem_flags PI_MEM_FLAGS_HOST_PTR_COPY = CL_MEM_COPY_HOST_PTR;

sycl/source/detail/device_image_impl.hpp

@@ -175,7 +175,7 @@ class device_image_impl {
       const detail::plugin &Plugin = getSyclObjImpl(MContext)->getPlugin();
       Plugin.call<PiApiKind::piMemBufferCreate>(
           detail::getSyclObjImpl(MContext)->getHandleRef(),
-          PI_MEM_FLAGS_ACCESS_RO | PI_MEM_FLAGS_HOST_PTR_USE,
+          PI_MEM_FLAGS_ACCESS_RW | PI_MEM_FLAGS_HOST_PTR_USE,
           MSpecConstsBlob.size(), MSpecConstsBlob.data(), &MSpecConstsBuffer,
           nullptr);
     }