sbcl-1.5.3 released

Dear all,

You can now find the freshly-uploaded sbcl-1.5.3 release at Sourceforge,
for download and tagged in git.  The principal changes in this release
are appended below.

I wish you a good end of May,

Best wishes,

Christophe

changes in sbcl-1.5.3 relative to sbcl-1.5.2:
  * platform support:
    - RISC-V: numerous bug fixes and improvements
    - all platforms: better run-program performance when used from multiple
      threads.
  * enhancement: (declaim (optimize (debug 2))) ensures compilation of
    top-level forms, providing better debugging for simple forms that are
    otherwise "byte-code interpreted" when compiled into FASLs.
  * bug fix: use of finalizers could in rare circumstances cause a crash in
    the garbage collector.
  * bug fix: show extended function designators, e.g. (setf foo), in the
    disassembler
  * optimization: reduced overhead of calling NTH/NTHCDR.
  * optimization: improved FLOAT-SIGN on DOUBLE-FLOATs on 64-bit platforms