[Alignment] fix dubious min function alignment
Summary:
This was discovered while introducing the llvm::Align type.
The original setMinFunctionAlignment used to take alignment as log2, looking at the comment it seems like instructions are to be 2-bytes aligned and not 4-bytes aligned.
Reviewers: uweigand
Subscribers: hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D67271
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@371204 91177308-0d34-0410-b5e6-96231b3b80d8