Add control registers for the icache #19
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This PR adds control registers for the instruction cache. Two variants are included, one assuming the L0 statistics are connected to performance counters within the core (
*_perfctr*
), and one with dedicated registers for these performance counters. This is designed to be used with clusters that themselves do not have internal registers to control the instruction cache, so are not mandatory but provide an example for how to expose these statistics.