Enable use of default platform context extension #627
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Instead of using sycl::context(const sycl::device &D) constructor to created cached context, use sycl::queue(const sycl::device &D) and extract context from the queue. For capable compiler, i.e. the one that supports https://github.com/intel/llvm/blob/sycl/sycl/doc/extensions/PlatformContext/PlatformContext.adoc the queue constructor will use platform default context. For other compilers the sycl::context(D) will get called, so the behavior won't change. If compiler supports default platform context extension, use that when building the cached.
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If compiler supports default platform context extension, use that when building the cached.