Revert "C++: Don't generate parameter nodes for bodyless parameters when there is a summary of the enclosing function."

This reverts commit ad80b36074.

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowPrivate.qll

@@ -1009,7 +1009,7 @@ class CastNode extends Node {
 }
 
 cached
-newtype TDataFlowCallable =
+private newtype TDataFlowCallable =
   TSourceCallable(Cpp::Declaration decl) or
   TSummarizedCallable(FlowSummaryImpl::Public::SummarizedCallable c)
 

cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowUtil.qll

@@ -66,7 +66,6 @@ private newtype TIRDataFlowNode =
   TFinalGlobalValue(Ssa::GlobalUse globalUse) or
   TInitialGlobalValue(Ssa::GlobalDef globalUse) or
   TBodyLessParameterNodeImpl(Parameter p, int indirectionIndex) {
-    not exists(TSummarizedCallable(p.getFunction())) and
     // Rule out parameters of catch blocks.
     not exists(p.getCatchBlock()) and
     // We subtract one because `getMaxIndirectionsForType` returns the maximum