Fix sub-group load/store extension disabling logic #1979
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Code sections which use
sycl::sub_group::<load()|store()>DPC++ extension are not entirely disabled. Non-template expressions are still checked by a compiler even if they are within a discardedif constexprbranch.This makes the code non-compatible with compilers other than DPC++, and it results in a deprecation warning with the most recent DPC++ builds.
A mock-up example: https://godbolt.org/z/svhnY14r5
Even though the extension is deprecated, it still may make sense to keep the surrounding logic in case it can be reused with #1976 vector load/store or with
SYCL_EXT_ONEAPI_GROUP_LOAD_STOREextension.