make SM::getColumnNumber take a predecomposed FileID/offset, which
makes it clear to clients that they have to pick an instantiation
or spelling location before calling it and allows optimization based
on that.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63698 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed