rts/RtsSymbols: Add AArch64 outline atomic operations
Fixes #22012 (closed) by adding the symbols described in https://github.com/llvm/llvm-project/blob/main/llvm/docs/Atomics.rst#libcalls-atomic.
Ultimately this would be better addressed by #22011, but this is a first step in the right direction and fixes the immediate symptom.
Note that we dropped the __arch64_cas16 operations as these are not provided
by all platforms' compilers.
Generated via $5733.
To do
-
test to verify correctness of wrappers -
write Note