[PATCH][Mips] Refactoring mips STO code

[Jack Carter]

This patch removes dummy directive calls and XFAILs the test cases that depend on them

This patch takes out the "Hack" from the STO routines.

This patch exposes the fact that we use the TargetStreamer method for STO in AsmPrinter and not in AsmParser. This needs to be fixed, but this patch is just an exercise in refactoring that changes no real functionality.

Jack
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