[SYCL] target enumeration SYCL 2020 update: deprecate global_buffer #4588
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The SYCL 2020 spec deprecates four of the enumeration values and replaces them with two new ones. While mostly a fairly straightforward change, I realize this is beginning to touch a lot of code, which will make it difficult to review. So I'm breaking it into smaller chunks.
We've already added device::target in a previous PR. In this PR we are simply marking target::global_buffer as deprecated and updating its uses in the code base.