Remove integer to pointer cast in Handle implementation

... so that Handle::from_raw is more friendly to miri tests with strict provenance.

Closes #996

Author: 06393993

ash/src/vk.rs

@@ -33,7 +33,7 @@ pub use platform_types::*;
 pub trait Handle: Sized {
     const TYPE: ObjectType;
     fn as_raw(self) -> u64;
-    fn from_raw(_: u64) -> Self;
+    fn from_raw(_: *mut u8) -> Self;
 
     /// Returns whether the handle is a `NULL` value.
     ///

ash/src/vk/macros.rs

@@ -137,8 +137,8 @@ macro_rules! define_handle {
             fn as_raw(self) -> u64 {
                 self.0 as u64
             }
-            fn from_raw(x: u64) -> Self {
-                Self(x as _)
+            fn from_raw(x: *mut u8) -> Self {
+                Self(x)
             }
         }
         unsafe impl Send for $name {}