Start handling debug line and scope information better:

Migrate most of the location setting within the larger API in CGDebugInfo and
update a lot of callers.
Remove the existing file/scope change machinery in UpdateLineDirectiveRegion
and replace it with DILexicalBlockFile usage.

Finishes off the rest of rdar://10246360

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141732 91177308-0d34-0410-b5e6-96231b3b80d8
9 files changed