tcg: Split out tcg/oversized-guest.h

Move a use of TARGET_LONG_BITS out of tcg/tcg.h.
Include the new file only where required.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/arm/ptw.c

@@ -14,6 +14,7 @@
 #include "cpu.h"
 #include "internals.h"
 #include "idau.h"
+#include "tcg/oversized-guest.h"
 
 
 typedef struct S1Translate {

target/riscv/cpu_helper.c

@@ -31,6 +31,7 @@
 #include "sysemu/cpu-timers.h"
 #include "cpu_bits.h"
 #include "debug.h"
+#include "tcg/oversized-guest.h"
 
 int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
 {