[PATCH] extra libclang functionality for the xdress project

[Geoffrey Irving]

Here are four patches improving libclang in various ways for use in
xdress (http://xdress.org).  In order, they add

1. Python support for clang_formatDiagnostic.
2. Access to public / private / protected specifiers.
3. Template argument access (as new cursor types).
4. A clang_Cursor_getDefaultArgument function.

They've all been tested inside xdress, but the patches themselves do
not include tests.  Since questions about this stuff to cfe-dev were
ignored, I want to make sure these patches will be looked at before I
do potentially unnecessary work.

Caveat: llvm trunk does not build for me due to these errors:

    llvm-build: error: invalid native target: 'x86_64' (not in project)

Therefore, these patches were written, built, and tested again
release_33 plus several cherry-picked libclang commits.  It's possible
they don't compile against the trunk.

Any ideas what would have caused this build breakage since release_33?

Thanks,
Geoffrey
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