changes in sbcl-2.2.8 relative to sbcl-2.2.7:

  * minor incompatible change: support for 32-bit x86/Darwin has been removed.
  * bug fix: fix miscompilation related to empty infinite loops preceded by
    conditional expressions. (lp#1986810, reported by Artyom Bologov)
  * bug fix: fix gc invariant violations.  (lp#1983218, reported by Marius
    Gerbershagen; lp#1983248, reported by Vasily Postnicov)
  * bug fix: use CC to compile SBCL as a shared library.  (lp#1976148,
    reported by Pierre Neidhardt)
  * bug fix: don't crash the system completely if RUN-PROGRAM fails to create
    a pipe.  (lp#1979841, reported by Thor Kristofferson)
  * bug fix: be more disciplined about use of C system includes.  (lp#1981799,
    reported by Mark Evenson)
  * bug fix: STRING/= returning wrong results for some cases when :END1/:END2
    were not compile-time constants.  (lp#1983284)
  * bug fix: compile-time checking of :START and :END keyword arguments to
    FILL is more complete.
  * optimization: adjacent type tests on the same value are more compact
    (arm64, x86-64).
  * optimization: the compiler can inline COPY-STRUCTURE in more cases.
  * optimization: type checks for non-simple arrays are shorter.
  * optimization: printing strings (as Lisp data) is faster.
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