[SSP] Remove llvm.stackprotectorcheck.

This is a cleanup patch for SSP support in LLVM. There is no functional change.
llvm.stackprotectorcheck is not needed, because SelectionDAG isn't
actually lowering it in SelectBasicBlock; rather, it adds check code in
FinishBasicBlock, ignoring the position where the intrinsic is inserted
(See FindSplitPointForStackProtector()).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265851 91177308-0d34-0410-b5e6-96231b3b80d8
15 files changed