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Implement fast memory read/write on Linux

Instead of sticking with ptrace for every POSIX system, we can use
process_vm_readv and process_vm_writev on Linux. This will allow us to
do our memory operation with one syscall instead of many 4-byte reads
with ptrace.

If these fail, we still have a fallback to use the ptrace mechanism.

30 of 30 new or added lines in 1 file covered. (100.0%)

5195 of 10079 relevant lines covered (51.54%)

8789033574.42 hits per line