Check for libatomic dependency for atomic operations
Some platforms (e.g. RISC-V) require linking against libatomic for some (e.g. sub-word-sized) atomic operations.
Fixes #19119 (closed).
Some platforms (e.g. RISC-V) require linking against libatomic for some (e.g. sub-word-sized) atomic operations.
Fixes #19119 (closed).