changes in sbcl-2.2.9 relative to sbcl-2.2.8:

  * platform support:
    ** fix build on Darwin platforms with -fno-common.  (lp#1980570, thanks to
       Sergei Trofimovich)
    ** include /usr/local paths when building on FreeBSD.  (lp#1981112,
       reported by William G Lederer)
    ** several micro-optimizations on x86-64, including: better use of
       INC/SUB, better SAP+, shorter KEYWORDP, better argument count
       verification
    ** arm64: better KEYWORDP, better argument count verification
    ** fix build on 32-bit Windows.  (lp#1988534, thanks to Alexis Rivera)
    ** x86-64: WITH-PINNED-OBJECTS can pin constants.  (lp#1989037)
  * bug fix: make sb-simd build in compiler-only SBCL.  (thanks to Tonas
    Hlavaty)
  * bug fix: SB-SPROF:WITH-PROFILING now returns the value of its body (as was
    advertised in its documentation).
  * bug fix: catch malformed LET* forms in DEFMETHOD bodies.  (lp#1988880,
    reported by Patrick Poitras)
  * enhancement: better source form tracking for atoms in LET bindings.
  * optimization: reader character macro lookup is simpler and faster.
  * optimization: FILL-POINTER (and its setter) are more compact.
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