[PATCH] D149259: [analyzer][NFC] Use std::optional instead of custom "empty" state

[Donát Nagy via Phabricator via cfe-commits]

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This commit eliminates the uninitialized error state from the class RegionRawOffsetV2 (which is locally used by the Clang Static Analyzer
checker alpha.security.ArrayBoundV2) and replaces its use with std::optional.

Motivated by https://reviews.llvm.org/D148355#inline-1437928


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149259

Files:
  clang/lib/StaticAnalyzer/Checkers/ArrayBoundCheckerV2.cpp

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