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Simplify some of the patches by reverting some of the changed llvm / clang files to the original ones.


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This comes form Thomas Zimmermann to add the building PostgresSQL plugin
with CMake.


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but typeifo for Class.


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The ROOT autoloading works at two different levels:
  L1 - on missing declaration that Sema expects.
  L2 - on missing library symbol.

  If there is a missing library function it the LLVM JIT will inform us through
its lazy function creator. However, for the purpose of the autoloading we need to
react not only to missing functions but to missing any symbols. Thus we need to
enhance the non-function symbol search to fire the lazy function creator callback.
Note this is a gross hack, we should come up with a more elegant way of solving 
this.


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It is very weird, clang documentation says:
ASTContext::CreateTypeSourceInfo - Allocate an uninitialized TypeSourceInfo...
ASTContext::getTrivialTypeSourceInfo - Allocate a TypeSourceInfo where all locations...

We should use the getTrivialTypeSourceInfo all over the place...


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Please note there is still an issue with the initialization order of the graphic
libraries.


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Parser::Scope versus Sema::DeclContext are now checked for cross-vailidity.
Emit the TU-transaction explicitly instead of relying on a first transaction.
The typename extraction now takes a stream instead of a string to write to.
The llvm::Linker has much reduced functionality; use llvm::sys::Path instead to find dynamic libraries.


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committed.
Add some asserts.
Move setting of the DeclCollector's active transaction to happen after the state
gets changed to committed.


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