Lanai: Remove unnecessary canRealignStack() override; NFC

It was doing the same as the base implementation and was irritating me
when I was searching for backends that have custom behavior for
canRealignStack.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301495 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed