[PATCH] Template Instantiation Observer + a few other templight-related changes

[Sven Mikael Persson]

This patch adds a base-class called TemplateInstantiationObserver which gets notified whenever a template instantiation is entered or exited during semantic analysis. This is a base class used to implement the template profiling and debugging tool called Templight (https://github.com/mikael-s-persson/templight).

The patch also makes a few more changes:
 - ActiveTemplateInstantiation class is moved out of the Sema class (so it can be used with inclusion of Sema.h).
 - CreateFrontendAction function in front-end utilities is given external linkage (not longer a hidden static function).
 - TemplateInstObserverChain data member added to Sema class to hold the list of template-inst observers.
 - Notifications to the template-inst observer are added at the key places where templates are instantiated.

I believe this patch should be fairly uncontroversial as the changes are very limited. I tried to keep them minimal, it does not add any end-user feature or bug-fix, and the impact to the main-line code is negligible. AFAIK, all LLVM / Clang guidelines have been respected.

The patch was made against r219658.

http://reviews.llvm.org/D5767

Files:
  include/clang/FrontendTool/Utils.h
  include/clang/Sema/ActiveTemplateInst.h
  include/clang/Sema/Sema.h
  include/clang/Sema/TemplateInstObserver.h
  lib/FrontendTool/ExecuteCompilerInvocation.cpp
  lib/Parse/ParseAST.cpp
  lib/Sema/ActiveTemplateInst.cpp
  lib/Sema/CMakeLists.txt
  lib/Sema/Sema.cpp
  lib/Sema/SemaTemplateInstantiate.cpp
  lib/Sema/SemaTemplateInstantiateDecl.cpp
  lib/Sema/SemaType.cpp
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