[PATCH], Update cpu-builtin-1.c test on PowerPC

[Michael Meissner <meissner at linux dot vnet dot ibm dot com>]

This patch modifies the change I made on July 12th.  It modifies the test for
the __builtin_cpu_is and __builtin_cpu_supports built-in functions to use an
#ifdef instead of target-requires for doing the tests.  One motavation is to
make the back port to GCC 6/7 easier, as I won't have to back port the change
to add the target option ppc_cpu_supports_hw.

I've checked the trunk with compilers built with a new GLIBC and without, and
it passes both compilers.  I also checked the back port to GCC 6/7 and both
work fine as well.

Can I check this patch into the trunk and backports to GCC 6 and 7?

2017-07-18  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/81193
	* gcc.target/powerpc/cpu-builtin-1.c: Change test to use #ifdef
	__BUILTIN_CPU_SUPPORTS to see if the GLIBC is new enough that
	__builtin_cpu_is and __builtin_cpu_supports are supported.

-- 
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meissner@linux.vnet.ibm.com, phone: +1 (978) 899-4797

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