This PR adds more register class support in PowerPC,
mark OperandType for imm and memory operands.
Also added more unit tests for SnippetGenerator.
jsji on Sep 21 2020, 1:50 PM.Authored by
I think the code being added here (and perhaps the existing code as well) requires deep expertise in both PowerPC ISA and Exegesis. But I think with more descriptive comments, we can make it consumable for those that only check one of those boxes. So most of my comments are requests to add more descriptive/explanatory comments.