[NFC] Serialize/Deserialize Register Allocations during Allocation#750

F-Stuckmann wants to merge 6 commits into

stuckmann.superreg.rewriter.fix.empty.sublanesXilinx/llvm-aie:stuckmann.superreg.rewriter.fix.empty.sublanesfrom

stuckmann.reg.alloc.individual.pass.runXilinx/llvm-aie:stuckmann.reg.alloc.individual.pass.runCopy head branch name to clipboard