MIPS: Add FPU emulator counter for emulated delay slots.
Delay slot emulation in the FPU emulator is the only kernel user of an executable stack, it is also very slow. Add a counter so we can see how many of these emulations are done. Signed-off-by: David Daney <david.daney@cavium.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/8634/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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