MIPS: Fix build error if __xchg() is not getting inlined.
If __xchg() is not getting inlined the outline version of the function will have a reference to __xchg_called_with_bad_pointer() which does not exist remaining. Fixed by using BUILD_BUG_ON() to check for allowable operand sizes. Signed-off-by: Ralf Baechle <email@example.com> Patchwork: http://patchwork.linux-mips.org/patch/705/
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