changes in sbcl-2.1.4 relative to sbcl-2.1.3:
* platform support:
** work around address-space randomization causing instability on new
versions of MinGW. (lp#1921141)
* bug fix: RANDOM on floats returns values strictly less than the float
argument.
* bug fix: compiler error on x86-64 resulting from attempting to zero a
memory location with xor. (reported by Eric Marsden)
* optimization: extended loops updating iteration variables with THEN can
perform specialized arithmetic for those updates.
* optimization: in some cases, the jump table resulting from a compilation
of TYPECASE is simpler.
* optimization: on x86-64, IF BOUNDP followed by SYMBOL-VALUE can elide some
memory loads and tests.