C++: Delete unused file ValueCategory.qll

cpp/ql/src/semmle/code/cpp/ir/implementation/ValueCategory.qll

@@ -1,44 +0,0 @@
-private import cpp
-
-private newtype TValueCategory =
-  TLValue() or
-  TXValue() or
-  TPRValue()
-
-abstract class ValueCategory extends TValueCategory {
-  abstract string toString();
-}
-
-abstract class GLValue extends ValueCategory {
-}
-
-abstract class RValue extends ValueCategory {
-}
-
-class LValue extends GLValue, TLValue {
-  override string toString() {
-    result = "lvalue"
-  }
-}
-
-class XValue extends GLValue, RValue, TXValue {
-  override string toString() {
-    result = "xvalue"
-  }
-}
-
-class PRValue extends RValue, TPRValue {
-  override string toString() {
-    result = "prvalue"
-  }
-}
-
-ValueCategory getExprValueCategory(Expr expr) {
-  (
-    expr.isLValueCategory() and result instanceof LValue
-  ) or (
-    expr.isXValueCategory() and result instanceof XValue
-  ) or (
-    expr.isPRValueCategory() and result instanceof PRValue
-  )
-}