[llvm] [RISCV] Loosen the requirement of shadow stack codegen to Zimop (PR #152251)

[Kito Cheng via llvm-commits]

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@@ -14,40 +14,40 @@
 
 # CHECK-ASM-AND-OBJ: c.sspopchk t0
 # CHECK-ASM: encoding: [0x81,0x62]
-# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+# CHECK-NO-EXT: error: instruction requires the following: 'Zimop' (May-Be-Operations){{$}}
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kito-cheng wrote:

The error message should be `Zcmop` here?

https://github.com/llvm/llvm-project/pull/152251