GlobalISel: cache pointer sizes in LLT

Otherwise everything that needs to work out what size they are has to keep a
DataLayout handy, which is a bit silly and very annoying.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281597 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed