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

[Ábel Sinkovics]

We are working on an interactive shell supporting template metaprogramming, which includes a template metaprogram debugger that needs the functionality this patch provides. Currently our utility is using another implementation of this functionality but we are actively working on migrating our tool to use this patch and therefore its acceptance would make the development and deployment of our utility **much** easier.

Our application can be found here: https://github.com/sabel83/metashell
The (yet unmerged) branch which migrates to a version of Clang using this patch can be found here: https://github.com/r0mai/metashell


http://reviews.llvm.org/D5767

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