Simplify libm-test extra-output initialization

[Andreas Jaeger]

On 05/17/2013 05:44 PM, Joseph S. Myers wrote:
> The structures describing libm-test tests for functions with extra
> outputs (through pointers or implicitly through global variables) have
> fields for how to initialize those extra outputs.  These are
> unnecessary and this patch changes the initialization to compute at
> runtime a value known to be different from the expected output value.
> Tested x86_64 and x86.
>
> (This patch is intended as a step towards the goal of gen-libm-test.pl
> not having anything hardcoded about particular named functions.)

ok, thanks,

Andreas
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