[Backport 3.0.x] Use proper qualification in allocate.h (#4796) (#6126)

* Use proper qualification in allocate.h (#4796)

Fixes [BUG]: Ambiguous call to __do_deallocate_handle_size when compiling with clang and libc++ #4793

* Keep sink for `__align`

---------

Co-authored-by: Michael Schellenberger Costa <[email protected]>

Author: wmaxey

libcudacxx/include/cuda/std/__new/allocate.h

@@ -76,14 +76,14 @@ using ::std::align_val_t;
 _LIBCUDACXX_HIDE_FROM_ABI void* __cccl_allocate(size_t __size, size_t __align)
 {
 #if _LIBCUDACXX_HAS_ALIGNED_ALLOCATION()
-  if (__is_overaligned_for_new(__align))
+  if (_CUDA_VSTD::__is_overaligned_for_new(__align))
   {
     const align_val_t __align_val = static_cast<align_val_t>(__align);
-    return __cccl_operator_new(__size, __align_val);
+    return _CUDA_VSTD::__cccl_operator_new(__size, __align_val);
   }
 #endif // _LIBCUDACXX_HAS_ALIGNED_ALLOCATION()
   (void) __align;
-  return __cccl_operator_new(__size);
+  return _CUDA_VSTD::__cccl_operator_new(__size);
 }
 
 template <class... _Args>
@@ -100,27 +100,27 @@ _LIBCUDACXX_HIDE_FROM_ABI void __do_deallocate_handle_size(void* __ptr, size_t _
 _LIBCUDACXX_HIDE_FROM_ABI void __cccl_deallocate(void* __ptr, size_t __size, size_t __align)
 {
 #if _LIBCUDACXX_HAS_ALIGNED_ALLOCATION()
-  if (__is_overaligned_for_new(__align))
+  if (_CUDA_VSTD::__is_overaligned_for_new(__align))
   {
     const align_val_t __align_val = static_cast<align_val_t>(__align);
-    return __do_deallocate_handle_size(__ptr, __size, __align_val);
+    return _CUDA_VSTD::__do_deallocate_handle_size(__ptr, __size, __align_val);
   }
 #endif // _LIBCUDACXX_HAS_ALIGNED_ALLOCATION()
   (void) __align;
-  return __do_deallocate_handle_size(__ptr, __size);
+  return _CUDA_VSTD::__do_deallocate_handle_size(__ptr, __size);
 }
 
 _LIBCUDACXX_HIDE_FROM_ABI void __cccl_deallocate_unsized(void* __ptr, size_t __align)
 {
 #if _LIBCUDACXX_HAS_ALIGNED_ALLOCATION()
-  if (__is_overaligned_for_new(__align))
+  if (_CUDA_VSTD::__is_overaligned_for_new(__align))
   {
     const align_val_t __align_val = static_cast<align_val_t>(__align);
-    return __cccl_operator_delete(__ptr, __align_val);
+    return _CUDA_VSTD::__cccl_operator_delete(__ptr, __align_val);
   }
 #endif // _LIBCUDACXX_HAS_ALIGNED_ALLOCATION()
   (void) __align;
-  return __cccl_operator_delete(__ptr);
+  return _CUDA_VSTD::__cccl_operator_delete(__ptr);
 }
 
 _LIBCUDACXX_END_NAMESPACE_STD