[compiler-rt] [compiler-rt] Build the builtins library for AArch64 big endian (PR #225996)

[dong jianqiang via llvm-commits]

dongjianqiang2 wrote:

 Hi @petrhosek @compnerd — could one of you take a look when you have a chance? This enables the builtins library for aarch64_be.

https://github.com/llvm/llvm-project/pull/225996