4470 overly aggressive D integer narrowing breaks 32-bit ustack helpers

*** 382,391 ****
--- 382,392 ----
  file path=opt/SUNWdtrt/tst/common/arithmetic/tst.compnarrowassign.d mode=0444
  file path=opt/SUNWdtrt/tst/common/arithmetic/tst.compnarrowassign.d.out \
      mode=0444
  file path=opt/SUNWdtrt/tst/common/arithmetic/tst.execcast.d mode=0444
  file path=opt/SUNWdtrt/tst/common/arithmetic/tst.execcast.d.out mode=0444
+ file path=opt/SUNWdtrt/tst/common/arithmetic/tst.nonarrow.ksh mode=0444
  file path=opt/SUNWdtrt/tst/common/arrays/err.D_ARR_BADREF.bad.d mode=0444
  file path=opt/SUNWdtrt/tst/common/arrays/err.D_DECL_ARRBIG.toobig.d mode=0444
  file path=opt/SUNWdtrt/tst/common/arrays/err.D_DECL_ARRNULL.bad.d mode=0444
  file path=opt/SUNWdtrt/tst/common/arrays/err.D_DECL_ARRSUB.bad.d mode=0444
  file path=opt/SUNWdtrt/tst/common/arrays/err.D_DECL_PROTO_TYPE.badtuple.d \