target/sparc: Use DYNAMIC_PC_LOOKUP for v9 RETURN

After the register window unwind, this is for a plain indirect
branch with no further side effects.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230628071202.230991-8-richard.henderson@linaro.org>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

target/sparc/translate.c

@@ -5029,7 +5029,7 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
                 gen_mov_pc_npc(dc);
                 gen_check_align(cpu_tmp0, 3);
                 tcg_gen_mov_tl(cpu_npc, cpu_tmp0);
-                dc->npc = DYNAMIC_PC;
+                dc->npc = DYNAMIC_PC_LOOKUP;
                 goto jmp_insn;
 #endif
             } else {