Convert FindFunctionInStream to return an error_code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194084 91177308-0d34-0410-b5e6-96231b3b80d8
Implement AArch64 Neon Crypto instruction classes AES, SHA, and 3 SHA.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194085 91177308-0d34-0410-b5e6-96231b3b80d8