libgo: test linking split-stack and non-split-stack together
    
    PPC has split-stack support in current GCC, but old version of gold will
    reject attempts to link PPC split-stack and non-split-stack code
    together.  Test for that, and don't compile the C code with
    -fsplit-stack if it doesn't work.
    
    Reviewed-on: https://go-review.googlesource.com/14594

From-SVN: r227802
3 files changed