From-SVN: r206298
From-SVN: r195697
* configure.tgt: Support powerpc-linux and powerpc-darwin. * config/linux/powerpc/futex_bits.h: New file. * config/powerpc/cacheline.h: New file. * config/powerpc/sjlj.S: New file. * config/powerpc/target.h: New file. * config/generic/asmcfi.h (cfi_offset): New. (cfi_restore, cfi_undefined): New. From-SVN: r182930