SWDEV-478929 - Benchmark ReallyQuickPureX Failed

Ensure the member function Alloc() and Free() of command_pool_ will not be
accessed after command_pool_ be destructed.

Signed-off-by: Chong Li <chongli2@amd.com>
Change-Id: Ic2d36423302518a030bd61fa399290ebe2ed8194

rocclr/platform/runtime.cpp

@@ -97,6 +97,7 @@ void Runtime::tearDown() {
   if (outFile != stderr && outFile != nullptr) {
     fclose(outFile);
   }
+  Command::ReleaseSysmemPool();
   initialized_ = false;
 }