julia

1e50a99f - Utilize bitshifts correctly in signals-mach.c when storing/reading the previous GC state (#53868)

Utilize bitshifts correctly in signals-mach.c when storing/reading the previous GC state (#53868) I have not succeed in writing a test for this, but this was found on a CI hang together with @keno and @vtjnash. In essence if we hit a safepoint while GC_SAFE things can go wrong <img width="748" alt="image" src="https://github.com/JuliaLang/julia/assets/28694980/7d8170ee-11ab-43de-9bb1-9219aa5a2d80">