Clean up output for pc break events, and remove a unneeded break event.

Clean up output for pc break events, and remove a unneeded break event.

cpu/pc_event.cc:
    Add a newline to the printout to clean up output
kern/linux/linux_system.cc:
    Remove the die_if_kernel pc break event, it is being called when not the kernel and leads to unneeded printouts

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extra : convert_revision : c359532db31c961074894cc6c44c8452592caca8