Previously, kernel symbols in offload binaries for SYCL had to be stored
as newline-separated strings and we had to use llvm::join and
line_iterator. It was needed because Offload Binary v1 format did not
store string value sizes. It is not necessary with Offload Binary v2
format, which stores string value size and hence eliminates the need for
newline separators.
81a8363ae3