[COFF, ARM64] Change setjmp for AArch64 Windows to use Intrinsic.sponentry

Summary: ARM64 setjmp expects sp on entry instead of framepointer.

Reviewers: mgrang, rnk, TomTan, compnerd, mstorsjo, efriedma

Reviewed By: mstorsjo

Subscribers: javed.absar, kristof.beyls, chrib, cfe-commits

Differential Revision: https://reviews.llvm.org/D53684

llvm-svn: 345792