changes in sbcl-2.1.3 relative to sbcl-2.1.2:

  * minor incompatible change: support for the :SB-SAFEPOINT-STRICTLY,
    :SB-THRUPTION, and :SB-WTIMER build features has been removed
  * platform support:
    ** support for :SB-CORE-COMPRESSION on Darwin/ARM64
    ** support ARM v8.1 atomic and compare-and-swap instructions
    ** x86, x86-64: microoptimizations in multiple type-checking routines
  * bug fix: structures and conditions are now TYPEP all classes in the class
    precedence list of their class.  (reported by Luis Oliveira)
  * bug fix: derivation of the result type from subtraction sometimes
    erroneously excluded zero.  (lp#1916895)
  * bug fix: reduce the number of places where the system permissively accepts
    * as a type specifier where it should not be accepted.  (lp#1860919)
  * bug fix: the code-walker used by the system's implementation of CLOS can
    handle defuns declared inline.  (reported by Don Cohen)
  * optimization: EQUALP on specialized vectors and arrays is faster.
  * optimization: support routines for EQUALP hash tables generate less garbage.
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