accel/tcg: Remove CPUState.icount_decr_ptr

We can now access icount_decr directly.

Reviewed-by: Anton Johansson <anjo@rev.ng>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

hw/core/cpu-common.c

@@ -86,7 +86,7 @@ void cpu_exit(CPUState *cpu)
     qatomic_set(&cpu->exit_request, 1);
     /* Ensure cpu_exec will see the exit request after TCG has exited.  */
     smp_wmb();
-    qatomic_set(&cpu->icount_decr_ptr->u16.high, -1);
+    qatomic_set(&cpu->neg.icount_decr.u16.high, -1);
 }
 
 static int cpu_common_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg)
@@ -130,7 +130,7 @@ static void cpu_common_reset_hold(Object *obj)
     cpu->halted = cpu->start_powered_off;
     cpu->mem_io_pc = 0;
     cpu->icount_extra = 0;
-    qatomic_set(&cpu->icount_decr_ptr->u32, 0);
+    qatomic_set(&cpu->neg.icount_decr.u32, 0);
     cpu->can_do_io = 1;
     cpu->exception_index = -1;
     cpu->crash_occurred = false;

include/exec/cpu-all.h

@@ -432,7 +432,6 @@ int cpu_exec(CPUState *cpu);
 static inline void cpu_set_cpustate_pointers(ArchCPU *cpu)
 {
     cpu->parent_obj.env_ptr = &cpu->env;
-    cpu->parent_obj.icount_decr_ptr = &cpu->parent_obj.neg.icount_decr;
 }
 
 /* Validate correct placement of CPUArchState. */

include/hw/core/cpu.h

@@ -429,7 +429,6 @@ struct qemu_work_item;
  * @as: Pointer to the first AddressSpace, for the convenience of targets which
  *      only have a single AddressSpace
  * @env_ptr: Pointer to subclass-specific CPUArchState field.
- * @icount_decr_ptr: Pointer to IcountDecr field within subclass.
  * @gdb_regs: Additional GDB registers.
  * @gdb_num_regs: Number of total registers accessible to GDB.
  * @gdb_num_g_regs: Number of registers in GDB 'g' packets.
@@ -504,7 +503,6 @@ struct CPUState {
     MemoryRegion *memory;
 
     CPUArchState *env_ptr;
-    IcountDecr *icount_decr_ptr;
 
     CPUJumpCache *tb_jmp_cache;