changes in sbcl-2.4.7 relative to sbcl-2.4.6:

  * minor incompatible change: the compiler will emit optimization notes
    related to complex type checks only at high SPEED optimization settings.
  * minor incompatible change: the GET-FOREGROUND symbol is now exported from
    the SB-THREAD package.  (thanks to Philipp Marek)
  * minor incompatible change: code objects are now printed with their ending
    address as well as their start address.
  * platform support:
    ** fix occasional saved core corruption on Win32.  (reported by Luís
       Borges de Oliveira)
    ** address some crashing cases in arena support.  (reported by Andreas
       Franke)
    ** fix a hard-coded path to `cp`.  (thanks to Hraban Luyat)
    ** address relocation issues on PIC-flavoured arm64.  (lp#2067153, thanks
       to leafze)
    ** fix a crash in the arm64-dissassembler if a code component is missing.
    ** fix a crash on 32-bit musl libc systems.  (reported by Will Sinatra)
    ** fix building with link-time optimization.  (lp#2072800, reported by Eli
       Schwartz)
    ** fix building with newer llvm.  (lp#2071545, reported by Yan)
    ** mitigate the lack of gc-safety in SB-VM::REMOVE-STATIC-LINKS.
       (lp#2045433)
  * bug fix: COMPILE installs its second argument as the value of its non-null
    NAME argument, even if the second argument was already compiled.
    (lp#2071324, reported by Tim Bradshaw)
  * bug fix: allow the hashing routines in sb-md5 to work on arrays with more
    than 2^29 elements.
  * bug fix: allow READ-SEQUENCE and WRITE-SEQUENCE to read and write files
    bigger than 4GB.
  * bug fix: READ-SEQUENCE returns the index of the first unmodified element
    of its sequence.  (reported by Janis Dzerins)
  * optimization: various improvements to floating point rounding routines.
  * optimization: PHASE called on the result of COMPLEX now elides the
    intermediate COMPLEX object.
  * optimization: the compiler is more aware of the types of COMPLEX, ATAN,
    APPEND and NCONC.
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