Calls to ___chkstk_darwin result in HLIL statements with no apparent side effects #7343

100005874    int64_t sub_100005874(int64_t arg1, int64_t arg2, int64_t arg3 @ x20)

100005884        int64_t var_20 = arg3
100005898        int64_t var_c0 = arg1
1000058a0        void* x0 = _$s8Dispatch0A13WorkItemFlagsVMa(0)
1000058a8        void* x8 = *(x0 - 8)
1000058b0        *(x8 + 0x40)

^-- what is this?

1000058d0        void* x21 = &var_c0 - ((___chkstk_darwin() + 0xf) & 0xfffffffffffffff0)
1000058dc        void* x0_1 = _$s8Dispatch0A3QoSVMa(0)
1000058e0        void* x8_5 = *(x0_1 - 8)
1000058e8        *(x8_5 + 0x40)

^-- what is this?

100005908        void* x23 = x21 - ((___chkstk_darwin() + 0xf) & 0xfffffffffffffff0)
100005914        void* x0_2 = _$s8Dispatch0A4TimeVMa(0)
10000591c        void* x27 = *(x0_2 - 8)
100005920        *(x27 + 0x40)

^-- what is this?

100005940        void* x22 = x23 - ((___chkstk_darwin() + 0xf) & 0xfffffffffffffff0)
10000595c        void* x25 = x22 - ___chkstk_darwin()