inline some function of StateData and takes captures by rvalue (highlighter_benchmark 2.5% faster)

jonathan poelenrequested to merge
jpoelen/syntax-highlighting:reduce_copy_capture into master

Inline some function of StateData and takes captures by rvalue to reduce copies (highlighter_benchmark 2.5% faster)

In addition:

  • Q_ASSERT(!isEmpty()) is removed because it duplicates the assertion in m_contextStack.last().
  • QPair is replaced by an internal structure (StackValue) to have more explicit names than first and second. This is also slightly more efficient.

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