Use ta0 instead of t4 and ta1 instead of t5.  These map to the same registers on O32 builds, but t4 and t5 don't exist on N32 or N64.
Use ta0 instead of t4 and ta1 instead of t5.  These map to the same
registers on O32 builds, but t4 and t5 don't exist on N32 or N64.

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