tcg/tci: Merge INDEX_op_ld16s_{i32,i64}

Eliminating a TODO for ld16s_i64.

Tested-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/tci.c

@@ -599,7 +599,7 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
             t2 = tci_read_s32(&tb_ptr);
             tci_write_reg(regs, t0, *(uint16_t *)(t1 + t2));
             break;
-        case INDEX_op_ld16s_i32:
+        CASE_32_64(ld16s)
             t0 = *tb_ptr++;
             t1 = tci_read_r(regs, &tb_ptr);
             t2 = tci_read_s32(&tb_ptr);
@@ -861,9 +861,6 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
 
             /* Load/store operations (64 bit). */
 
-        case INDEX_op_ld16s_i64:
-            TODO();
-            break;
         case INDEX_op_ld32u_i64:
             t0 = *tb_ptr++;
             t1 = tci_read_r(regs, &tb_ptr);