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This commit bulk-updates the libclc license headers to the current Apache-2.0 WITH LLVM-exception license in situations where they were previously attributed to AMD - and occasionally under an additional single individual contributor - under an MIT license. AMD signed the LLVM relicensing agreement and so agreed for their past contributions under the new LLVM license. The LLVM project also has had a long-standing, unwritten, policy of not adding copyright notices to source code. This policy was recently written up [1]. This commit therefore also removes these copyright notices at the same time. Note that there are outstanding copyright notices attributed to others - and many files missing copyright headers - which will be dealt with in future work. [1] https://llvm.org/docs/DeveloperPolicy.html#embedded-copyright-or-contributed-by-statements