[clang][SYCL] Set default device and host triples for SYCL device compilation (#172366) This PR checks whether the triple specified for SYCL device compilation is supported. If the triple is not specified, assume a default of spirv64-unknown-unknown. While a driver invocation does set the default triple when invoked, this PR is required to fix a crash for cc1 invocations when an invalid/no triple is specified. This PR also sets HostTriple from -aux-triple to inherit host type properties during SYCL device compilation. Fixes https://github.com/llvm/llvm-project/issues/167358
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