changes in sbcl-2.1.5 relative to sbcl-2.1.4:

  * minor incompatible change: on x86-64, the backend instruction encoders for
    movzx and for string opcodes have changed their semantics.
  * platform support:
    ** compatibility: support the latest MinGW on x86.  (lp#1923325, thanks to
       Alexis Rivera)
    ** bug fix: on x86-64, fix instruction encoding for TEST on RIP-relative
       addresses.  (lp#1925808, reported by Shinmera on #sbcl, thanks also to
       3b)
    ** bug fix: on x86-64, loading all-1s into an AVX2 register no longer
       causes an error.  (thanks to Marco Heisig)
    ** bug fix: on arm64, improve disassembly of ADD with constant 0 as MOV
    ** enhancement: on arm64, support debugger commands RETURN-FROM-FRAME and
       RESTART-FRAME more efficiently.
    ** enhancement: on x86-64, add support for vshuf* AVX2 instructions.
       (reported by Bela Pecsek)
    ** optimization: faster function calls on arm64.
    ** optimization: (SETF SBIT) is faster on x86-64.
  * bug fix: INTEGER-DECODE-FLOAT was computing the wrong answer for denormal
    double floats.  (lp#1926383, reported by Stavros Macrakis)
  * bug fix: RANDOM on a floating point argument now does not cons.  (reported
    by Tito Latini)
  * bug fix: fix a compiler crash in type derivation of LOGTEST.  (lp#1928243)
  * bug fix: fix a compiler failure when a declared function type contains a
    literal structure with a valid MAKE-LOAD-FORM method.  (lp#1929160, thanks
    to Yurii Hryhorenko)
  * optimization: FBOUNDP on a constant symbol is now faster.
  * optimization: file compilation now produces smaller fasls for files which
    reference package literals.
  * optimization: derive the type of calls to FLOAT-SIGN.
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