[RISCV] Use sspush/sspopchk mnemonics for shadow stack codegen (#200182) After PR #178609, SSPUSH/SSPOPCHK/C_SSPUSH became encodable under the Zimop/Zcmop predicates alone (old Zicfiss requirement was relaxed to Zimop). Before that, the hw-shadow-stack codegen path introduced in PR #152251 needed PseudoMOP_* wrappers that expand to the base MOP_RR_7/MOP_R_28/C_MOP_1, because the real SSPUSH/SSPOPCHK/C_SSPUSH were gated by Zicfiss while the codegen path only required Zimop. As a side effect, the assembler printed `mop.rr.7 zero, zero, ra`/`mop.r.28 zero, ra` for hw-shadow-stack functions instead of the proper `sspush ra`/`sspopchk ra` mnemonics from the CFI RISC-V spec (while the disassembler already printed proper sspush/sspopchk. With predicates now aligned, the pseudos are just plain wrappers with identical predicates to the real instructions, so they became redundant. This patch removes them and emits SSPUSH/SSPOPCHK/C_SSPUSH directly.
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