add AllocRange Debug impl; remove redundant AllocId Display impl

compiler/rustc_middle/src/mir/interpret/allocation.rs

@@ -160,12 +160,18 @@ impl AllocError {
 }
 
 /// The information that makes up a memory access: offset and size.
-#[derive(Copy, Clone, Debug)]
+#[derive(Copy, Clone)]
 pub struct AllocRange {
     pub start: Size,
     pub size: Size,
 }
 
+impl fmt::Debug for AllocRange {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "[{:#x}..{:#x}]", self.start.bytes(), self.end().bytes())
+    }
+}
+
 /// Free-starting constructor for less syntactic overhead.
 #[inline(always)]
 pub fn alloc_range(start: Size, size: Size) -> AllocRange {