[llvm] [clang] [RISCV] Add MC layer support for Zicfiss. (PR #66043)

[Craig Topper via cfe-commits]

================
@@ -60,12 +60,3 @@ defm SSAMOSWAP_W  : AMO_rr_aq_rl<0b01001, 0b010, 
"ssamoswap.w">;
 
 let Predicates = [HasStdExtZicfiss, IsRV64] in
 defm SSAMOSWAP_D  : AMO_rr_aq_rl<0b01001, 0b011, "ssamoswap.d">;
-
-//===----------------------------------------------------------------------===/
-// Compress Instruction tablegen backend.
-//===----------------------------------------------------------------------===//
-
-let Predicates = [HasStdExtZicfiss, HasStdExtCOrZca] in {
----------------
topperc wrote:

I guess you can't test is because Zicfiss implies Zcmop. But you should be able 
to disable compression with `.option norvc`

https://github.com/llvm/llvm-project/pull/66043
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