We can calculate the variable type up front before calling
`DebugLocEntry::finalize()`. In fact, since we only care about the type
if it's an `MDBasicType`, don't even bother resolving it using the type
identifier map.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235201 91177308-0d34-0410-b5e6-96231b3b80d8