[PATCH 4/4] exec/cpu-all: Include 'cpu.h' earlier so MMU_USER_IDX is always defined

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Include "cpu.h" earlier to get the MMU_USER_IDX definition soon
enough and avoid when refactoring unrelated headers:

  In file included from include/exec/translator.h:271,
                   from ../../accel/tcg/translator.c:13:
  include/exec/cpu-all.h: In function ‘cpu_mmu_index’:
  include/exec/cpu-all.h:274:12: error: ‘MMU_USER_IDX’ undeclared (first use in this function)
    274 |     return MMU_USER_IDX;
        |            ^~~~~~~~~~~~
  include/exec/cpu-all.h:274:12: note: each undeclared identifier is reported only once for each function it appears in
  ninja: build stopped: subcommand failed.

We need to forward-declare cpu_mmu_index() to avoid on user emulation:

  In file included from include/exec/cpu-all.h:263,
                   from include/exec/translator.h:271,
                   from ../../accel/tcg/translator.c:13:
  ../../target/sparc/cpu.h: In function ‘cpu_get_tb_cpu_state’:
  ../../target/sparc/cpu.h:757:13: error: implicit declaration of function ‘cpu_mmu_index’ [-Werror=implicit-function-declaration]
    757 |     flags = cpu_mmu_index(env_cpu(env), false);
        |             ^~~~~~~~~~~~~

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 include/exec/cpu-all.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index f7eea33b101..09f537d06fa 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -180,8 +180,12 @@ CPUArchState *cpu_copy(CPUArchState *env);
      | CPU_INTERRUPT_TGT_EXT_3   \
      | CPU_INTERRUPT_TGT_EXT_4)
 
+#include "cpu.h"
+
 #ifdef CONFIG_USER_ONLY
 
+static inline int cpu_mmu_index(CPUState *cs, bool ifetch);
+
 /*
  * Allow some level of source compatibility with softmmu.  We do not
  * support any of the more exotic features, so only invalid pages may
@@ -271,7 +275,6 @@ static inline bool tlb_hit(uint64_t tlb_addr, vaddr addr)
 #endif /* !CONFIG_USER_ONLY */
 
 /* Validate correct placement of CPUArchState. */
-#include "cpu.h"
 QEMU_BUILD_BUG_ON(offsetof(ArchCPU, parent_obj) != 0);
 QEMU_BUILD_BUG_ON(offsetof(ArchCPU, env) != sizeof(CPUState));
 
-- 
2.45.2