Improve traceRA printing in tabular form

[fjeremic]

There was some work already done in this area long ago, but it never materialized. There is all but a few comments and #if 0 guarded code left in the codebase [1] throughout. Looking over the attempt seemed to be to transform our printing of register states during traceRA into a tabular form.

This seems like a good idea since printing GPRs, FPRs, and VRFs linearly takes up quite a lot of space for not much information displayed. The right hand side of the log is mostly empty as each print line is not wide. Transforming this into a concise tabular form makes tracing RA much simpler.

We need to do several things here:

• Investigate what code currently exists
• Investigate what kind of information we currently display and whether all of it is useful
• Draw out an example of how the new table will look like
• Take into consideration cross-platform specifics
• Once we are agreed implement the new printing logic at the common level

[1] https://github.com/eclipse/omr/blob/57e5bbb65e043b9c8528ffadbc103f71629625cf/compiler/ras/Debug.cpp#L3189-L3198

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[fjeremic]

This is definitely something on my radar and something we want to improve.