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Restrict spe_acc to PowerPC SPE targets Update the tests, add powerpc-*-gnuspe testing, and create a distinct clobber_abi list for PowerPC SPE targets. Note, the SPE target does not have vector, vector-scalar, or floating-point specific registers. r? ```@Amanieu```
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.