memory: export memory_region_access_valid to exec.c

We'll use it to implement address_space_access_valid.
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

include/exec/memory-internal.h

@@ -45,6 +45,9 @@ void address_space_destroy_dispatch(AddressSpace *as);
 
 extern const MemoryRegionOps unassigned_mem_ops;
 
+bool memory_region_access_valid(MemoryRegion *mr, hwaddr addr,
+                                unsigned size, bool is_write);
+
 ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
                                    MemoryRegion *mr);
 ram_addr_t qemu_ram_alloc(ram_addr_t size, MemoryRegion *mr);

memory.c

@@ -851,10 +851,10 @@ const MemoryRegionOps unassigned_mem_ops = {
     .endianness = DEVICE_NATIVE_ENDIAN,
 };
 
-static bool memory_region_access_valid(MemoryRegion *mr,
-                                       hwaddr addr,
-                                       unsigned size,
-                                       bool is_write)
+bool memory_region_access_valid(MemoryRegion *mr,
+                                hwaddr addr,
+                                unsigned size,
+                                bool is_write)
 {
     if (mr->ops->valid.accepts
         && !mr->ops->valid.accepts(mr->opaque, addr, size, is_write)) {