Add support for Symmetric Memory Registration

From NCCL 2.27.x we can now use the Symmetric Memory APIs (-R 2)


[ROCm/rccl-tests commit: a5c539e68b]

projects/rccl-tests/README.md

@@ -78,7 +78,7 @@ All tests support the same set of arguments :
   * `-z,--blocking <0/1>` Make NCCL collective blocking, i.e. have CPUs wait and sync after each collective. Default : 0.
   * `-G,--cudagraph <num graph launches>` Capture iterations as a CUDA graph and then replay specified number of times. Default : 0.
   * `-C,--report_cputime <0/1>]` Report CPU time instead of latency. Default : 0.
-  * `-R,--local_register <1/0>` enable local buffer registration on send/recv buffers. Default : 0.
+  * `-R,--local_register <0/1/2> enable local (1) or symmetric (2) buffer registration on send/recv buffers. Default : 0.
   * `-T,--timeout <time in seconds>` timeout each test after specified number of seconds. Default : disabled.
 
 ### Running multiple operations in parallel