Use private linkage for globals we already name with \01L and \01l.

In llvm the only semantic difference between internal and private is that llvm
tries to hide private globals my mangling them with a private prefix. Since
the globals changed by this patch already had the magic don't mangle marker,
there should be no change in the generated assembly.

A followup patch should then be able to drop the \01L and \01l prefixes and let
llvm mangle as appropriate.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@202419 91177308-0d34-0410-b5e6-96231b3b80d8
Remove constructors from FileEntry that prevent owning resources

This cleans up some constructors that would not be safe once FileEntry
owns the storage for its name. These were already suspect, since they
wouldn't work if the FileEntry had an open file descriptor. The only
user for these constructors was in UniqueFileContainer, which wasn't a
very useful abstraction anyway. So it and UniqueDirContainer have been
replaced with std::map<UniqueID, *>.

This change should not affect anything outside the FileManager.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@202420 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "Remove constructors from FileEntry that prevent owning resources"

This reverts commit r202420, which broke the build.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@202421 91177308-0d34-0410-b5e6-96231b3b80d8
MS ABI: Fix vftable mangling by using the vbtable name algorithm

Summary:
This merges VFPtrInfo and VBTableInfo into VPtrInfo, since they hold
almost the same information.  With that change, the vbtable mangling
code can easily be applied to vftable data and we magically get the
correct, unambiguous vftable names.

Fixes PR17748.

Reviewers: timurrrr, majnemer

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D2893

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@202425 91177308-0d34-0410-b5e6-96231b3b80d8