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This commit renames 4 pattern rewriter API functions: * `updateRootInPlace` -> `modifyOpInPlace` * `startRootUpdate` -> `startOpModification` * `finalizeRootUpdate` -> `finalizeOpModification` * `cancelRootUpdate` -> `cancelOpModification` The term "root" is a misnomer. The root is the op that a rewrite pattern matches against (https://mlir.llvm.org/docs/PatternRewriter/#root-operation-name-optional). A rewriter must be notified of all in-place op modifications, not just in-place modifications of the root (https://mlir.llvm.org/docs/PatternRewriter/#pattern-rewriter). The old function names were confusing and have contributed to various broken rewrite patterns. Note: The new function names use the term "modify" instead of "update" for consistency with the `RewriterBase::Listener` terminology (`notifyOperationModified`).