sbcl-2.1.7

changes in sbcl-2.1.7 relative to sbcl-2.1.6:
  * incompatible change: on certain platforms (currently just x86-64),
    dynamic-extent arrays specialized on character and numeric types and
    created without either :INITIAL-ELEMENT or :INITIAL-CONTENTS will reflect
    previous contents of the stack instead of #\null (or 0) in all elements.
  * minor incompatible change: SB-SPROF:START-PROFILING no longer silently
    does nothing if the clock is already running. It instead stop and restarts
    with the newly provided options, and warns.
  * minor incompatible change: the system attempts to refer to the supplied
    pathname in compiler diagnostics, if relevant, rather than the truename.
  * enhancement: new contrib module sb-graph producing graphical
    visualizations of Intermediate Representations of SBCL compilation data
    structures.
  * platform support:
    ** improved code generation for unary minus in modular contexts on arm64.
    ** make the disassembler annotations slightly more robust on arm64.
    ** release space back to the Operating System on Windows.
    ** improve the test for whether pages need to be committed on Windows.
    ** fix a bug in the use of the VPCMPEQD opcode on x86-64.  (lp#1928516,
       thanks to Marco Heisig)
  * optimization: the type of (LOOP ... COLLECT ...), and the type of COLLECT
    INTO variables, is derived as LIST.  (lp#1934577, reported by SATO
    shinichi)
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