changes in sbcl-2.2.1 relative to sbcl-2.2.0:

  * incompatible change: DEFINE-ALIEN-CALLBACK, which has never been exported
    from a public package, has been deleted.  It is superseded by
    SB-ALIEN:DEFINE-ALIEN-CALLABLE.
  * minor incompatible change: compiler warnings are emitted on more
    provably-erroneous code involving sequence functions on specialized
    arrays.
  * platform support:
    ** support getting thread IDs on FreeBSD.  (thanks to Felix Lange)
    ** faster function call sequence on arm64.
    ** the built-in buffer size for file streams is increased to 8KB.
  * enhancement: provide a restart for method lambda list mismatches that
    fmakunbounds the generic function.
  * enhancement: provide a USE-VALUE restart around type errors signalled from
    (SETF SLOT-VALUE).
  * enhancement: when UPDATE-INSTANCE-FOR-DIFFERENT-CLASS (or -REDEFINED-)
    undergoes a non-local exit, restore the instance to its original state.
    (thanks to Michał phoe Herda)
  * enhancement: the :SYNCHRONIZED keyword argument to MAKE-HASH-TABLE is no
    longer experimental.
  * bug fix: fix an erroneous compiler tranform for (EXPT SINGLE-FLOAT
    INTEGER).  (lp#1958061, thanks to Vasily Postnicov)
  * bug fix: disassembly of closures is more likely to show the relevant code
    if more than one closure closes over the same environment.  (lp#1956870,
    reported by Michał phoe Herda)
  * bug fix: RUN-PROGRAM with :IF-EXISTS :APPEND no longer signals an error if
    the output does not exist.  (lp#1958569, thanks to Ingo Krabbe)
  * optimization: reorder basic blocks to have loop code fall through more
    often.  (thanks to Hayley Patton)
  * optimization: sequences larger than the buffer size are written to streams
    without going through a buffering stage.  (reported by Philipp Marek)
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