[NFC][SpecialCaseList] Move "LongestMatch" logic from WarningsSpecialCaseList into SpecialCaseList#162409

vitalybuka merged 5 commits intomainllvm/llvm-project:mainfrom

users/vitalybuka/spr/nfcspecialcaselist-move-longestmatch-logic-from-warningsspecialcaselist-into-specialcaselistllvm/llvm-project:users/vitalybuka/spr/nfcspecialcaselist-move-longestmatch-logic-from-warningsspecialcaselist-into-specialcaselistCopy head branch name to clipboard