Executer: Add back pointing reference of method operand.

This patch adds back pointing reference of the namespace node for a method
operand. The namespace node then can be used in
AcpiDsTerminateControlMethod() to obtain method full path to be used by
tracing facilities. Lv Zheng.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>

source/components/executer/excreate.c

@@ -599,6 +599,7 @@ AcpiExCreateMethod (
 
     ObjDesc->Method.AmlStart = AmlStart;
     ObjDesc->Method.AmlLength = AmlLength;
+    ObjDesc->Method.Node = Operand[0];
 
     /*
      * Disassemble the method flags. Split off the ArgCount, Serialized

source/components/utilities/utdelete.c

@@ -292,6 +292,10 @@ AcpiUtDeleteInternalObj (
             AcpiUtDeleteObjectDesc (Object->Method.Mutex);
             Object->Method.Mutex = NULL;
         }
+        if (Object->Method.Node)
+        {
+            Object->Method.Node = NULL;
+        }
         break;
 
     case ACPI_TYPE_REGION:

source/include/acobject.h

@@ -285,6 +285,7 @@ typedef struct acpi_object_method
     UINT8                           ParamCount;
     UINT8                           SyncLevel;
     union acpi_operand_object       *Mutex;
+    union acpi_operand_object       *Node;
     UINT8                           *AmlStart;
     union
     {