* lisp.h: Redo flags and XSET slightly to avoid overflow diagnostics.
These changes make compilation easier to follow with Sun cc. (ARRAY_MARK_FLAG): Make it signed, so that it can be assigned to EMACS_INT values without provoking overflow diagnostics. (PSEUDOVECTOR_FLAG): Likewise, for consistency. (XSET) [! USE_LSB_TAG]: Use unsigned left shift to avoid overflow diagnostic with signed left shift.
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