target/arm: Change DisasContext.aarch64 to bool

Bool is a more appropriate type for this value.
Move the member down in the struct to keep the
bool type members together and remove a hole.

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

target/arm/translate-a64.c

@@ -14664,7 +14664,7 @@ static void aarch64_tr_init_disas_context(DisasContextBase *dcbase,
     dc->isar = &arm_cpu->isar;
     dc->condjmp = 0;
 
-    dc->aarch64 = 1;
+    dc->aarch64 = true;
     /* If we are coming from secure EL0 in a system with a 32-bit EL3, then
      * there is no secure EL1, so we route exceptions to EL3.
      */

target/arm/translate.c

@@ -9334,7 +9334,7 @@ static void arm_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
     dc->isar = &cpu->isar;
     dc->condjmp = 0;
 
-    dc->aarch64 = 0;
+    dc->aarch64 = false;
     /* If we are coming from secure EL0 in a system with a 32-bit EL3, then
      * there is no secure EL1, so we route exceptions to EL3.
      */

target/arm/translate.h

@@ -59,12 +59,12 @@ typedef struct DisasContext {
      * so that top level loop can generate correct syndrome information.
      */
     uint32_t svc_imm;
-    int aarch64;
     int current_el;
     /* Debug target exception level for single-step exceptions */
     int debug_target_el;
     GHashTable *cp_regs;
     uint64_t features; /* CPU features bits */
+    bool aarch64;
     /* Because unallocated encodings generate different exception syndrome
      * information from traps due to FP being disabled, we can't do a single
      * "is fp access disabled" check at a high level in the decode tree.