Vedran Miletić authored Nov 22, 2016 and Francisco Jerez committed Nov 24, 2016

The commit 8e430ff8

 broke support for
LLVM 3.9 and older versions in Clover. This patch restores it and
refactors the support using Clover compatibility layer for LLVM.

v2: merged #ifdef blocks
v3: added support for LLVM 3.6-3.8
v4: add missing #ifdef around <memory>
v5: simplify using templates and lambda

Signed-off-by: Vedran Miletić <vedran@miletic.net>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98740


Tested-by[v4]: Pierre Moreau <pierre.morrow@free.fr>
Tested-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Reviewed-by: Jan Vesely <jan.vesely@rutgers.edu>