Add test for `DefIncrement` and `DefDecrement`

tests/inc.asl

@@ -0,0 +1,9 @@
+DefinitionBlock("inc.aml", "DSDT", 1, "RSACPI", "INCDEC", 1) {
+    Name(X, 0)
+    X++
+    X++
+    X++
+    Name(Y, 0)
+    Y = X
+    X--
+}