GETF, LOGBITP, LDB, and MASK-FIELD now arrange for non-primary values
of multiple-valued places to be set to NIL, instead of signalling an
error (per a careful reading of CLHS 5.1.2.3).
- * bug fix: floating-point traps now work on darwin/x86-64.
+ * bug fix: floating-point traps now work on darwin/x86 and /x86-64.
* bug fix: repair crash in x86oid darwin signal handling emulation
when built with certain compilers.