Fix #14863 (tokenizer: add token flag when braces are inserted during simplifications and publish in dumpfile)

[danmar]

No description provided.

[Copilot]

Pull request overview

This PR addresses #14863 by tracking braces that are inserted by tokenizer simplifications via a new Token flag and exposing that information in the tokenizer dump output.

Changes:

• Add Token::isInsertedBrace flag and emit it as isInsertedBrace="true" in Tokenizer::dump().
• Mark braces as inserted when adding braces during simplification (e.g., simplifyAddBracesPair(), elseif()).
• Add a unit test that validates the dump contains the inserted-brace marker after while(a); is simplified.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
test/testtokenize.cpp	Adds a regression test ensuring the dump output includes isInsertedBrace="true" after brace insertion.
lib/tokenize.cpp	Emits the new dump attribute and sets the inserted-brace flag during relevant simplifications.
lib/token.h	Introduces the new token flag and repurposes the prior simplified-scope flag into an if/switch/for-init-statement flag.
lib/checkother.cpp	Updates logic to use the new flags (isInsertedBrace, isSimplifiedIfInitStmt) instead of the removed isSimplifiedScope.

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