[PATCH] TableGen: Generate an enum for all named Operand types

[Ahmed Bougacha]

Hi Quentin, all,

Here's the next patch I had waiting for review.
In some situations it's very useful to have access to an enum of all
operand types (that is, instances of Operand in the target's tablegen
files).
My use for this is associating MI/SD-pattern level operands with the
underlying list of MC operand, and keeping track of that association.
I also sent a nice-to-have feature implemented in another email
(complete machine operand printing) that was very helpful for
debugging and testing.

Thanks!
- Ahmed

---
 docs/WritingAnLLVMBackend.rst       |  3 +++
 utils/TableGen/InstrInfoEmitter.cpp | 31 +++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
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