Following are the changes:
1. Make OffloadKind enum values to be powers of two so we can use them
like a bitfield
2. Include OFK_SYCL enum value
3. Modify ActiveOffloadKinds support in clang-linker-wrapper to use
bitfields instead of a vector.
Thanks
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Signed-off-by: Arvind Sudarsanam <arvind.sudarsanam@intel.com>