[rtl] cleanups and optimizations #569
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is now a global/package constant
minor optimizations
do not try to load the trap-causing instruction word when a instruction access fault exception has been raised
* add PMP execute test * cleanups and optimizations
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time[h]registers. Any access to these registers will trap. It is recommended that the trap handler software provides a means of accessing the platform-defined MTIME machine timer." - same concept is used in Ibex/openTitan 😉