Add backend type query method, use it to disable 32bit amo testers on gda (#307)

* Add backend type query method, use it to disable 32bit amo testers on
gda

* The infrateam testers work

[ROCm/rocshmem commit: 8c175315f2]

projects/rocshmem/src/backend_bc.hpp

@@ -276,6 +276,8 @@ class Backend {
    */
   TeamTracker team_tracker{};
 
+  BackendType get_backend_type() { return type; }
+
  protected:
   /**
    * @brief Required to support static inheritance for device calls.

projects/rocshmem/src/backend_type.hpp

@@ -46,7 +46,7 @@ namespace rocshmem {
  * @note Derived classes which use Backend as a base class must add
  * themselves to this enum class to support static polymorphism.
  */
-enum class BackendType { GDA_BACKEND, RO_BACKEND, IPC_BACKEND };
+//enum class BackendType { GDA_BACKEND, RO_BACKEND, IPC_BACKEND };
 
 /**
  * @brief Helper macro for some dispatch calls

projects/rocshmem/src/rocshmem.cpp

@@ -81,6 +81,8 @@ rocshmem_ctx_t ROCSHMEM_HOST_CTX_DEFAULT;
  * Begin Host Code
  **/
 
+BackendType get_backend_type() { return backend->get_backend_type(); }
+
 #if defined(USE_GDA) && defined(USE_RO) && defined(USE_IPC)
 static BackendType select_backend_type() {
   BackendType type;