1. The available program storage region of the red zone to compilers is 288
bytes rather than 244 bytes.
2. The formula for negative number alignment calculation should be
y = x & ~(n-1) rather than y = (x + (n-1)) & ~(n-1).
Differential Revision: https://reviews.llvm.org/D34337
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307672 91177308-0d34-0410-b5e6-96231b3b80d8
