Recommit:

    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

after fixing a few bugs that were exposed in gdb testsuite testing.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141893 91177308-0d34-0410-b5e6-96231b3b80d8
10 files changed