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fix builtin-math-2.c on fma targets

From: Richard Henderson <rth at redhat dot com>
To: GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Mon, 15 Nov 2010 15:53:49 -0800
Subject: fix builtin-math-2.c on fma targets

The existing test scans for the fma builtins remaining.  Unfortunately,
if fma is supported on the target we've already folded these to FMA_EXPR.

Fixed by adjusting the test case to make sure that (1) FMA_EXPR folds to
a constant, proving that (2) FMA_EXPR with overflowing constants tests
what we intend to test.

Tested on ia64-linux with all fma patches applied.  Committed.


r~

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