[PR41276, PR41307] don't leak VALUEs into VAR_LOCATION NOTEs

[Alexandre Oliva]

On Sep  8, 2009, Jakub Jelinek <jakub@redhat.com> wrote:

> I think this still isn't right, whenever we shallow_copy_rtx (orig),
> its SUBREG_REG will still be invalidly shared (think of MEM with some fancy
> address inside it, could even have VALUE in its address and leak to
> dwarf2out).

Agreed.  Taking orig without VALUE substitution is never right.

> The important question is, do we want less pedantic rules for SUBREGs
> in DEBUG_INSNs?

No reason not to.

Here's what I'm testing.  Ok to install if it passes regtesting?

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Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
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