MFH (r313975, r315909, r317827, r344533): upgrade to latest OpenPAM

Approved by: re (gjb)

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Upgrade our copy of clang, llvm and lldb to 3.6.0 release.

Please note that from 3.5.0 onwards, clang/llvm/lldb require C++11
support to build; see UPDATING for more information.

Release notes for llvm and clang can be found here:
<http://llvm.org/releases/3.6.0/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.6.0/tools/clang/docs/ReleaseNotes.html>

Thanks to Ed Maste for the lldb part of this upgrade.

Exp-run: antoine

Upgrade to OpenPAM Ourouparia.

Remove incorrect props

Update to OpenPAM Nummularia.

MFV (r255364): move the code around in preparation for Nummularia.

Upgrade to OpenPAM Lycopsida.

Remove empty directories from the HEAD.

Discussed with: developers, imp

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