debuginfoless static user probes

[Stan Cox]

This patch implements adding info to the .probes section to access probe 
arguments and since the probe address is also in the .probes section this 
means no debuginfo is required for a process("proc").mark("mark") probe.  So 
here is a patch to implement that and also to implement not needing debuginfo 
for .mark probes.  The diffs are large but some of this is mechanical.  I put 
'#####' comments in the patch.  Comments?
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