[PATCH] Sema: Instantiating variable definitions weren't local enough

[David Majnemer]

Hi rsmith, doug.gregor,

We wouldn't properly save and restore the pending local instantiations
we had built up prior to instantiation of a variable definition.  This
would lead to us instantiating too much causing crashes and other
general badness.

Depends on D2236.
Fixes PR14374.

http://llvm-reviews.chandlerc.com/D2238

Files:
  include/clang/Sema/Sema.h
  lib/Sema/SemaTemplate.cpp
  lib/Sema/SemaTemplateInstantiate.cpp
  lib/Sema/SemaTemplateInstantiateDecl.cpp
  test/CXX/temp/temp.spec/temp.inst/p1.cpp
  test/SemaTemplate/instantiate-local-class.cpp
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