Revert Clang 3.4 API compatibility changes

Re-apply previously reverted changes to restore LLDB to parity with
the last update as of upstream revision 202189. This is the first step
an LLDB update to correspond with the Clang 3.5 import and re-applies
the following upstream revisions:

  SVN      git
199408  3ad0a1a1
199689  05be72c3
200085  9ad47a93

Sponsored by: DARPA, AFRL