MIPS: Avoid potential hazard on Context register
set_saved_sp reads Context register. Avoid reading stale value from earlier incomplete write. Issue found and fixed for head.S by Chris Dearman <chris@mips.com>. Signed-off-by: NChris Dearman <chris@mips.com> Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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