copy_rtx() bug (?)

[Jeffrey A Law]

  In message < 199710011833.TAA00922@mvmap66.ciw.uni-karlsruhe.de >you write:
  > Stack frames are:
  >         pc=0x081c2ce4 in copy_rtx() at rtl.c:325
  >         pc=0x081c2c77 in copy_rtx() at rtl.c:320
Yuk.

Short of having gen_rtx fill in all fields of the rtx I'm not sure what
can be done about this.

Basically it's harmless -- the field being copied isn't setup or examined
until flow is run.

There's probably lots of these kinds of problems in code which copies
rtl and/or trees.

Suggestions welcome...

jeff