[compiler-rt] [AArch64][compiler-rt] Add memcpy, memset, memmove, memchr builtins. (PR #77496)

[Jeremy Morse via llvm-commits]

jmorse wrote:

Looks like that cleared the bots -- @dtemirbulatov you should be able to make the same fix to the line you deleted in `lit.common.unit.configured.in` to restore coverage.

https://github.com/llvm/llvm-project/pull/77496