[PATCH] Sema: Subst type default template args earlier

[David Majnemer]

    - Sema: Instantiate default template args earlier
    - Add some tests

Hi doug.gregor, rjmccall, rsmith,

http://llvm-reviews.chandlerc.com/D1507

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1507?vs=3838&id=3845#toc

Files:
  lib/Sema/SemaTemplate.cpp
  lib/Sema/SemaTemplateInstantiateDecl.cpp
  test/CodeGenCXX/mangle.cpp
  test/SemaCXX/cxx1y-deduced-return-type.cpp
  test/SemaCXX/trailing-return-0x.cpp
  test/SemaTemplate/default-arguments.cpp
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