rts: fix clang compilation on aarch64
This patch fixes function prototypes in ARMOutlineAtomicsSymbols.h which causes error: address argument to atomic operation must be a pointer to _Atomic type when compiling with clang on aarch64.
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This patch fixes function prototypes in ARMOutlineAtomicsSymbols.h which causes error: address argument to atomic operation must be a pointer to _Atomic type when compiling with clang on aarch64.