Remove supports_streams from custom RAFT memory resources (#2121)

Part of rapidsai/rmm#1389. This removes now-optional and soon-to-be deprecated `supports_streams()` from RAFT's custom `device_memory_resource` implementations.

Authors:
  - Mark Harris (https://github.com/harrism)
  - Corey J. Nolet (https://github.com/cjnolet)

Approvers:
  - Michael Schellenberger Costa (https://github.com/miscco)
  - Corey J. Nolet (https://github.com/cjnolet)

URL: #2121

cpp/bench/ann/src/common/cuda_huge_page_resource.hpp

@@ -41,14 +41,6 @@ class cuda_huge_page_resource final : public rmm::mr::device_memory_resource {
   cuda_huge_page_resource& operator=(cuda_huge_page_resource const&) = default;
   cuda_huge_page_resource& operator=(cuda_huge_page_resource&&)      = default;
 
-  /**
-   * @brief Query whether the resource supports use of non-null CUDA streams for
-   * allocation/deallocation. `cuda_huge_page_resource` does not support streams.
-   *
-   * @returns bool false
-   */
-  [[nodiscard]] bool supports_streams() const noexcept override { return false; }
-
  private:
   /**
    * @brief Allocates memory of size at least `bytes` using cudaMalloc.

cpp/bench/ann/src/common/cuda_pinned_resource.hpp

@@ -45,14 +45,6 @@ class cuda_pinned_resource final : public rmm::mr::device_memory_resource {
   cuda_pinned_resource& operator=(cuda_pinned_resource const&) = default;
   cuda_pinned_resource& operator=(cuda_pinned_resource&&)      = default;
 
-  /**
-   * @brief Query whether the resource supports use of non-null CUDA streams for
-   * allocation/deallocation. `cuda_pinned_resource` does not support streams.
-   *
-   * @returns bool false
-   */
-  [[nodiscard]] bool supports_streams() const noexcept override { return false; }
-
  private:
   /**
    * @brief Allocates memory of size at least `bytes` using cudaMalloc.