* Enable IPO (LTO) via CMake
* Use separate IPO_ENABLED variable
* Enabled IPO for more binaries
* Enabled IPO for arangobackup
* Suppress an MSVC warning (though it is not unjustified...)
* Fix static builds, broken due to Policy CMP0060 introduced in cmake 3.3
* Removed policies superseded by minimum cmake version
* Disable IPO with google tests due to a g++ bug
* Disable IPO with google tests only on AUTO
* Disable warning for correct line
* Begin de-inlining Aql
* de-inlining Aql: 2nd batch
* de-inlining Aql: 3rd batch
* de-inlining Aql: 4th batch
* Moved code out of ifdef
* Enabled IPO for additional libs
* Fixed some problems found with IPO enabled
- Fixed ODR violation in Pregel
- Removed unused code in ClusterMethods
- Avoid possible uninitialized variable usage
* Set IPO globally, except for 3rdParty libs
* De-inlined AstHelper again (was undone due to a previous merge conflict)
* Added missing .cpp file
* Fixed compilation with MSVC
* Removed superfluous includes from deinlined AQL header files
* Added includes for size_t
* Deleted outdated files
* De-inlined files that were undone during the merge
* Removed includes from files that were undone during merge
* Fixed merge conflicts
* move IResearchViewSort into separate unit
* ensure sort is propagated to IResearchLink
* update iresearch and extend some tests
* implement insertion of sorted values, store value comparator in link
* add tests for VPackComparer
* minor cleanup
* fix issue with sort definiton propagation
* propagate error message from index factory
* add integration tests for sorted indexes, single server
* initial implementation of IResearchViewMergeExecutor
* move iresearch::VPackComparer to separate translation unit
* store collection in IndexReadBuffer for IResearchViewMergeExecutor
* set primary sort from optimizer rule
* add some tests for sorted view case
* extend IResearchViewNode tests
* simplify primary sort definition
* pretty print order condition covered by arangosearch in query explanation
* fix compilation with g++-8
* address catch test failures
* fix tests
* adjust arangosearch optimizer rule to optimize sort in case of cluster
* make tests for sorted indexes work in cluster too
* fix tests
* extend js tests for sorted indices
* fix keyword in query explainer
* ensure sort-limit rule works with views
* backport ngram analyzer fix from upstream
* address jslint errors
* modify IResearchViewSort to support boolean direction specification format
* add some tests
* add tests
* add skip functionality
* extend tests
* add more catch tests
* inline some methods
* address jslint errors
* extend catch tests to reproduce the failure
* add some tests for check fullcount
* add more tests
* extend tests
* temporarily comment out broken tests
* extend js tests
* address review comments
* address jslint errors
* update iresearch