[Alignment][NFC] Convert MachineIRBuilder::buildDynStackAlloc to Align
Summary:
The change in IRTranslator is not trivial but is NFC as far as I can tell.
This is patch is part of a series to introduce an Alignment type.
See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2019-July/133851.html
See this patch for the introduction of the type: https://reviews.llvm.org/D64790
Reviewers: courbet
Subscribers: hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D77292