changes in sbcl-2.4.8 relative to sbcl-2.4.7:

  * bug fix: the elftool utility finds a writeable directory in more
    situations.  (thanks to Shinmera)
  * bug fix: SLOT-MAKUNBOUND does not attempt to dereference a PROGN variable
    in the interpreter.
  * bug fix: READ-SEQUENCE into displaced arrays with a non-zero offset now
    writes to the right memory location.
  * bug fix: fix some erroneous file position calculations in the editcore
    utility (exposed by a change in the libzstd compression implementation).
  * bug fix: do not break the build on STYLE-WARNINGs for earlier SBCL build
    hosts.  (lp#2064671, reported by Patrick Poitras)
  * bug fix: various bug fixes for ppc64le (lp#2074275, reported by Claude R. C.)
  * bug fix: address a rounding error in the TAN type deriver which led to a
    miscompile in cl-pdf.  (lp#2077100, reported by Gian Pierro Carrubba)
  * bug fix: overoptimization of FIND with a :TEST of CHAR-EQUAL.  (lp#2077539)
  * optimization: detection of duplicate names in loaded code now scales
    subquadratically.
  * optimization: switch from Floyd's to Brent's cycle detection for lists.
  * optimization: EQUAL on lists should be faster.
  * optimization: fewer filesystem operations are performed when working out
    what to LOAD.
  * optimization: various microoptimizations on hash tables and
    associated operations.
  * optimization: strings are now hashed using FNV-1A, replacing Bob Jenkins'
    one-at-a-time hash.
  * optimization: fewer redundant validations of the sequence bounding indices
    in POSITION on strings.
  * optimization: many improvements to type derivation on the arguments to and
    results of standard functions
  * optimization: adding many (hundreds) methods to a generic function can be
    done faster.
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