Simplify lisp.h in minor ways that should not affect code.
* lisp.h (USE_2_TAGS_FOR_INTS): Remove, as it was always defined. (LISP_INT_TAG, case_Lisp_Int, LISP_STRING_TAG, LISP_INT_TAG_P) (LISP_INT1_TAG, enum Lisp_Type, XINT, XUINT, make_number): Simplify under the assumption that USE_2_TAGS_FOR_INTS is defined. (INTTYPEBITS): New macro, for clarity. (INTMASK, MOST_POSITIVE_FIXNUM): Use it. (LISP_INT1_TAG, LISP_STRING_TAG, LISP_INT_TAG_P): Simplify now that USE_LSB_TAG is always defined. (TYPEMASK, XINT) [USE_LSB_TAG]: Remove unnecessary cast. (make_number) [!USE_LSB_TAG]: Use INTMASK; that's simpler.
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