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Fix debug/52727 -- lost REG_ARGS_SIZE note

From: Richard Henderson <rth at redhat dot com>
To: GCC Patches <gcc-patches at gcc dot gnu dot org>
Cc: Jakub Jelinek <jakub at redhat dot com>
Date: Fri, 30 Mar 2012 14:19:33 -0400
Subject: Fix debug/52727 -- lost REG_ARGS_SIZE note

Losing REG_ARGS_SIZE notes leads to assertion failures in dwarf2cfi.c
when the values don't match across CFG edges.

I'd like to leave this patch on mainline for a week or so to see what
falls out before copying it to the 4.7 branch.  There is a new abort
here, though I suppose that would probably only trigger when we would
abort later in dwarf2cfi.c anyway...

Tested on x86_64 (no-op, sanity), and i686 (-Os), and committed.


r~

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