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[i386] Don't expand vector abs+neg to xor immediately

From: Richard Henderson <rth at redhat dot com>
To: GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Fri, 22 Oct 2010 12:40:53 -0700
Subject: [i386] Don't expand vector abs+neg to xor immediately

This solves the problem that Richi saw on x86 with fma
plus negation on vectors not being merged into fnma etc
during combine.

Tested on x86_64-linux.


r~

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