Add sparcv9 support to lib/Basic/Targets.cpp

[Jakob Stoklund Olesen]

Hi,

Please review this patch which adds SPARC v9 support to Targets.cpp.

Triple::sparcv9 is the 64-bit counterpart to Triple::sparc. The architectures are very similar, so they share most of the TargetInfo implementation. I included operating systems with known sparcv9 ports in AllocateTarget().

This also fixes two issues with the existing 32-bit sparc data layout string: It was accidentally marked as little endian, and there was no stack alignment. A 64-bit aligned stack is required by the SPARC v8 System V ABI.

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Thanks,
/jakob