Removed update_llvm.sh dependence on GNU sed extensions
Removed update_llvm.sh dependence on GNU sed extensions

go-llvm/llvm,go-llvm/llvm,axw/go-llvm-testing,axw/go-llvm-testing,axw/go-llvm-testing,axw/go-llvm-testing,go-llvm/llvm,go-llvm/llvm