[DAGCombiner] Option --combiner-select-seq

Minimize condition-code lifetime for select sequences over constants in arithmetic progressions.
It reduces the number of comparisons and shortens the condition code lifetime, improving performance.

Original patch by Anmol Paralkar (@anmolparalkar-nxp), initially proposed on Phabricator as D136047.
Modified and updated to work with the latest LLVM version. The test case has been updated to match the current output format.

Author: anmolparalkar-nxp