mark raw_vec::ptr with inline

library/alloc/src/raw_vec.rs

@@ -220,6 +220,7 @@ pub unsafe fn from_raw_parts_in(ptr: *mut T, capacity: usize, alloc: A) -> Self
     /// Gets a raw pointer to the start of the allocation. Note that this is
     /// `Unique::dangling()` if `capacity == 0` or `T` is zero-sized. In the former case, you must
     /// be careful.
+    #[inline]
     pub fn ptr(&self) -> *mut T {
         self.ptr.as_ptr()
     }