[ARM][testsuite] Force -mcpu=cortex-a57 for vsel* tests.

[ARM][testsuite] Force -mcpu=cortex-a57 for vsel* tests.

2017-01-25  Christophe Lyon  <christophe.lyon@linaro.org>

	* gcc.target/arm/vseleqdf.c: Require arm_arch_v8a_ok, add
	-mcpu=cortex-a57.
	* gcc.target/arm/vseleqsf.c: Likewise.
	* gcc.target/arm/vselgedf.c: Likewise.
	* gcc.target/arm/vselgesf.c: Likewise.
	* gcc.target/arm/vselgtdf.c: Likewise.
	* gcc.target/arm/vselgtsf.c: Likewise.
	* gcc.target/arm/vselledf.c: Likewise.
	* gcc.target/arm/vsellesf.c: Likewise.
	* gcc.target/arm/vselltdf.c: Likewise.
	* gcc.target/arm/vselltsf.c: Likewise.
	* gcc.target/arm/vselnedf.c: Likewise.
	* gcc.target/arm/vselnesf.c: Likewise.
	* gcc.target/arm/vselvcdf.c: Likewise.
	* gcc.target/arm/vselvcsf.c: Likewise.
	* gcc.target/arm/vselvsdf.c: Likewise.
	* gcc.target/arm/vselvssf.c: Likewise.

From-SVN: r244903