The assumptions of linker_set don't play nicely with AddressSanitizer. AddressSanitizer adds a 'redzone' of zeros around globals (including those in named sections), whereas linker_set assumes they are all packed consecutively like a pointer array. So: let's annotate linker_set so that AddressSanitizer ignores it.

Adding Konstantin to the review as somebody who touched linker_set recently.

Manual testing to demonstrate that linker_set pointers are consecutive with no redzone. Compiled and ran the kernel and ran few kyua tests for sanity.