target/nios2: Hoist set of is_jmp into gen_goto_tb

Rather than force all callers to set this, do it
within the subroutine.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220421151735.31996-50-richard.henderson@linaro.org>

target/nios2/translate.c

@@ -192,6 +192,7 @@ static void gen_goto_tb(DisasContext *dc, int n, uint32_t dest)
         tcg_gen_movi_tl(cpu_pc, dest);
         tcg_gen_exit_tb(NULL, 0);
     }
+    dc->base.is_jmp = DISAS_NORETURN;
 }
 
 static void gen_jumpr(DisasContext *dc, int regno, bool is_call)
@@ -235,7 +236,6 @@ static void jmpi(DisasContext *dc, uint32_t code, uint32_t flags)
 {
     J_TYPE(instr, code);
     gen_goto_tb(dc, 0, (dc->pc & 0xF0000000) | (instr.imm26 << 2));
-    dc->base.is_jmp = DISAS_NORETURN;
 }
 
 static void call(DisasContext *dc, uint32_t code, uint32_t flags)
@@ -278,7 +278,6 @@ static void br(DisasContext *dc, uint32_t code, uint32_t flags)
     I_TYPE(instr, code);
 
     gen_goto_tb(dc, 0, dc->base.pc_next + (instr.imm16.s & -4));
-    dc->base.is_jmp = DISAS_NORETURN;
 }
 
 static void gen_bxx(DisasContext *dc, uint32_t code, uint32_t flags)
@@ -290,7 +289,6 @@ static void gen_bxx(DisasContext *dc, uint32_t code, uint32_t flags)
     gen_goto_tb(dc, 0, dc->base.pc_next);
     gen_set_label(l1);
     gen_goto_tb(dc, 1, dc->base.pc_next + (instr.imm16.s & -4));
-    dc->base.is_jmp = DISAS_NORETURN;
 }
 
 /* Comparison instructions */