Record kernel samples #736
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Perf emits `Mmap2` non-executable events for kernel (modules). Refactor `Converter` such that `Mmap2` also handles kernel events, and doesn't skip them because they're not executable.
Mimics `perf` so the kernel and modules' symbols are registered in `Converter`.
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Kernel samples are not recorded nor decoded during
samply record. This PR is two commits:perf, so thatConverteris notified of the kernel symbolsBased on #734.