Fix PR 61461: -fdump-rtl-all-slim causes ICE

[Bernd Edlinger <bernd dot edlinger at hotmail dot de>]

Hi,

When I try to print the dumps of fold-const.c
with -fdump-rtl-all-slim cc1plus crashes.
This is caused by pretty-printing the ADDR_VEC pattern,
which has a single argument, a vector of LABEL_REFs at position 0.
But instead XEXP(x,0) is printed, which causes the ICE.

However also ADDR_DIFF_VEC seems to do the wrong thing,
because the XEXP(0) is an uninteresting label, which references just
the own position.

Instead of that, the list of LABEL_REFs should be printed IMO,
which is at position 1, in this case.

The attached patch fixes both, by prining the list if LABEL_REFs
separated by semicolons.


Boot-strapped and regression-tested on x86_64-linux-gnu.
OK for trunk?


Thanks
Bernd.

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