Add benchtests for trunc and truncf

[Siddhesh Poyarekar]

On Tuesday 19 September 2017 04:50 AM, Joseph Myers wrote:
> This patch adds benchtests for the trunc and truncf functions.  The
> inputs listed are fairly arbitrary; I do not assert they are
> representative of any particular application.
> 
> 2017-09-18  Joseph Myers  <joseph@codesourcery.com>
> 
> 	* benchtests/Makefile (bench-math): Add trunc and truncf.
> 	(CFLAGS-bench-trunc.c): New variable.
> 	(CFLAGS-bench-truncf.c): Likewise.
> 	* benchtests/trunc-inputs: New file.
> 	* benchtests/truncf-inputs: Likewise.

Looks good.

Thanks,
Siddhesh