[PATCH][Mips] Default ELF header support for AsmParser

[Jack Carter]

This patch is the initial instalment for setting ELF header flags from the AsmParser at startup time.

Currently AsmPrinter  uses another method at process end, but if this patch is acceptable, I will migrate them to use the same method.

This doesn't address directive handling for ELF/ASM. That comes in the next patch.

Jack
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