MFC Clang debug info crash fix

MFC Clang debug info crash fix

271282: Merge Clang debug info crash fix rev 200797:

    Debug info: fix a crasher when when emitting debug info for
    not-yet-completed templated types. getTypeSize() needs a complete type.

    rdar://problem/15931354

271283: Add clang patch for r271282

  Note that r271282 contains only the src change from Clang rev 200797.
  This patch file includes two follow-on changes to the test case, which
  do not apply to the copy in the FreeBSD tree.

  Upstream Clang revisions:

  200797:

    Debug info: fix a crasher when when emitting debug info for
    not-yet-completed templated types. getTypeSize() needs a complete type.

    rdar://problem/15931354

  200798:

    Simplify testcase from r200797 some more.

  200805:

    Further simplify r200797 and add an explanatory comment.

PR:		193347

git-svn-id: svn://svn.freebsd.org/base/stable/9@272304 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f