[PATCH][MC/SPARC] Add support for EH to SPARC backend

[Venkatraman Govindaraju]

Please review the attached patch.

This patch enables exception handling (using DwarfCFI) for SPARC.

This patch also modifies MC layer so that the SPARC backend can emit
".cfi_window_save" and ".cfi_register" directives, which are required for
EH to work correctly in SPARC.

Thanks,
Venkatraman
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