Use Align for TFL::TransientStackAlignment

This is patch is part of a series to introduce an Alignment type.
See this thread for context:
See this patch for the introduction of the type:

Reviewers: courbet

Subscribers: arsenm, dschuff, jyknight, sdardis, jvesely, nhaehnle, sbc100, jgravelle-google, hiraditya, aheejin, fedor.sergeev, jrtc27, atanasyan, llvm-commits

Tags: #llvm

Differential Revision:

git-svn-id: 91177308-0d34-0410-b5e6-96231b3b80d8
14 files changed