Remove legacy microcode version check in GpuAgent::InvalidateCodeCaches

Fixes instruction cache invalidation when using microcode branches.

Change-Id: I932676e683983145f5c807204e592fb5e530c8af

runtime/hsa-runtime/core/runtime/amd_gpu_agent.cpp

@@ -1239,14 +1239,7 @@ void GpuAgent::InvalidateCodeCaches() {
       // Microcode is handling code cache invalidation.
       return;
     }
-  } else if (isa_->GetMajorVersion() == 9) {
-    if (properties_.EngineId.ui32.uCode < 334) {
-      static std::once_flag once;
-      std::call_once(
-          once, []() { fprintf(stderr, "warning: code cache invalidation not implemented\n"); });
-      return;
-    }
-  } else {
+  } else if (isa_->GetMajorVersion() > 9) {
     assert(false && "Code cache invalidation not implemented for this agent");
   }