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

[Jesse Huang via llvm-commits]

================
@@ -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){{$}}
----------------
jaidTw wrote:

Since the whole Zicfiss extension requires Zimop, I think it is fine?

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