Let the debugger knows DATAS is on

Author: cshung

src/coreclr/debug/daccess/request_common.h

@@ -113,6 +113,11 @@ inline bool IsBackgroundGCEnabled()
     return (g_gcDacGlobals->minor_version_number & 2) == 0;
 }
 
+inline bool IsDatasEnabled()
+{
+    return (g_gcDacGlobals->minor_version_number & 4) == 0;
+}
+
 // Load an instance of dac_gc_heap for the heap pointed by heap.
 // Fields that does not exist in the current gc_heap instance is zero initialized.
 // Return the dac_gc_heap object.

src/coreclr/gc/gc.cpp

@@ -52902,6 +52902,12 @@ void PopulateDacVars(GcDacVars *gcDacVars)
 #ifndef BACKGROUND_GC
     gcDacVars->minor_version_number |= 2;
 #endif //!BACKGROUND_GC
+#ifdef DYNAMIC_HEAP_COUNT
+    if (gc_heap::dynamic_adaptation_mode == dynamic_adaptation_to_application_sizes)
+    {
+        gcDacVars->minor_version_number |= 4;
+    }
+#endif //DYNAMIC_HEAP_COUNT
     gcDacVars->built_with_svr = &g_built_with_svr_gc;
     gcDacVars->build_variant = &g_build_variant;
     gcDacVars->gc_structures_invalid_cnt = const_cast<int32_t*>(&GCScan::m_GcStructuresInvalidCnt);