[vm/ffi] Changed Pointer::New 'native_address' type back to 'uword'

Addressing comment on
#42451 (review)

Closes #42559

GitOrigin-RevId: 29176b6
Change-Id: I2a23a0114aae7aa0d26467332ccf18b083a7e421
Cq-Include-Trybots: luci.dart.try:vm-ffi-android-debug-arm-try,vm-ffi-android-debug-arm64-try,app-kernel-linux-debug-x64-try,vm-kernel-linux-debug-ia32-try,vm-kernel-win-debug-x64-try,vm-kernel-precomp-android-release-arm64-try,vm-kernel-precomp-android-release-arm_x64-try,vm-kernel-mac-debug-x64-try,vm-precomp-ffi-qemu-linux-release-arm-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/153069
Commit-Queue: Daco Harkes <[email protected]>
Reviewed-by: Daco Harkes <[email protected]>

Author: inobelar

runtime/vm/object.cc

@@ -23468,7 +23468,7 @@ const char* ExternalTypedData::ToCString() const {
 }
 
 PointerPtr Pointer::New(const AbstractType& type_arg,
-                        size_t native_address,
+                        uword native_address,
                         Heap::Space space) {
   Thread* thread = Thread::Current();
   Zone* zone = thread->zone();

runtime/vm/object.h

@@ -10163,7 +10163,7 @@ class ByteBuffer : public AllStatic {
 class Pointer : public Instance {
  public:
   static PointerPtr New(const AbstractType& type_arg,
-                        size_t native_address,
+                        uword native_address,
                         Heap::Space space = Heap::kNew);
 
   static intptr_t InstanceSize() {