[PATCH, Darwin, PowerPC, testsuite] Exclude Darwin from VSX, Power8 and Power9 tests.

[Iain Sandoe]

Hi!

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.

tested on powerpc-darwin9 (with llvm-based assembler and cctools)
tested on powerpc-linux-gnu (power7 machine).

Applied to mainline.
Iain

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.

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