Revert "llvm coroutine workaround: sret functions return sret pointer"

This reverts commit 132e604aa399a3bcb91996e550cf8972bd88422c.

this workaround didn't work either
d243453862Andrew Kelley committed on 2/27/2018, 10:47:18 PMparent138d6f9
2 files changedLine totals unavailable