+ * optimization: APPEND is upto ~10% faster in normal SPEED policies.
+ * optimization: two argument forms of LAST are upto ~10% faster
+ in normal SPEED policies.
+ * optimization: NCONC no longer needs to heap cons its &REST list
+ in normal SPEED policies.
+ * bug fix: bogus errors when generating certain code sequences, due
+ to the compiler not accepting ANY-REG for primitive type T on x86
+ and x86-64. (reported by Stelian Ionescu.)
+ * bug fix: LAST when always returned the whole list when given a bignum
+ as the second argument.
+ * bug fix: dynamic extent allocation of nested lists and vectors
+ could leak to otherwise accessible parts.