C++: Deprecate ThrowingFunction and no longer use in IR

Author: jketema

cpp/ql/lib/semmle/code/cpp/ir/implementation/raw/internal/TranslatedCall.qll

@@ -363,14 +363,10 @@ class TranslatedFunctionCall extends TranslatedCallExpr, TranslatedDirectCall {
   }
 
   final override predicate mayThrowException() {
-    expr.getTarget().(ThrowingFunction).mayThrowException(_)
-    or
     expr.getTarget() instanceof AlwaysSehThrowingFunction
   }
 
   final override predicate mustThrowException() {
-    expr.getTarget().(ThrowingFunction).mayThrowException(true)
-    or
     expr.getTarget() instanceof AlwaysSehThrowingFunction
   }
 }

cpp/ql/lib/semmle/code/cpp/models/interfaces/Throwing.qll

@@ -12,8 +12,10 @@ import semmle.code.cpp.models.interfaces.FunctionInputsAndOutputs
 
 /**
  * A function that is known to raise an exception.
+ *
+ * DEPRECATED: use `AlwaysSehThrowingFunction` instead.
  */
-abstract class ThrowingFunction extends Function {
+abstract deprecated class ThrowingFunction extends Function {
   /**
    * Holds if this function may throw an exception during evaluation.
    * If `unconditional` is `true` the function always throws an exception.