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This reverts 0d3eee3 and 4c37d30. XSfcie is not an official SiFive extension name. It stands for SiFive Custom Instruction Extension, which is mentioned in the S76 manual, but then elsewhere in the manual says it is not supported for S76. LLVM had various instructions and CSRs listed as part of this extension, but as far as SiFive is concerned, none of them are part of it. There are no documented extension names for these instructions and CSRs either externally or internally. If these are important to LLVM users, I can facilitate creating extension names for them and have them documented. For now I'm removing everything. Unfortunately, these instructions and CSRs are in LLVM 17 so this is an incompatible change.
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