darwin, testsuite, powerpc - handle tests for new processors.

darwin, testsuite, powerpc - handle tests for new processors.

If we build Darwin with a modern assembler, then it might well
recognise insns that cannot be used on current Darwin systems.

The patch augments the tests for feature support for VSX,
power8 and power9 to exclude Darwin even if the assembler can
handle the instructions.

2019-05-15  Iain Sandoe  <iain@sandoe.co.uk>

	* lib/target-supports.exp
	(check_effective_target_powerpc_p8vector_ok): No support for Darwin.
	(check_effective_target_powerpc_p9vector_ok): Likewise.
	(check_effective_target_powerpc_float128_sw_ok): Likewise.
	(check_effective_target_powerpc_float128_hw_ok): Likewise.
	(check_effective_target_powerpc_vsx_ok): Likewise.
	* gcc.target/powerpc/bfp/bfp.exp: Don't try to run this for Darwin.
	* gcc.target/powerpc/dfp/dfp.exp: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@271205 138bc75d-0d04-0410-961f-82ee72b054a4