C++: Fix awful joins on bochs:

```
Evaluated relational algebra for predicate DataFlowPrivate::storeStepImpl/4#b2c79f9a@13be12rc with tuple counts:
           9   ~0%    {3} r1 = JOIN `FlowSummaryImpl::Private::Steps::summaryStoreStep/3#5c2d4899` WITH DataFlowUtil::TFlowSummaryNode#40da8361 ON FIRST 1 OUTPUT Lhs.2, Lhs.1, Rhs.1
           9   ~0%    {4}    | JOIN WITH DataFlowUtil::TFlowSummaryNode#40da8361 ON FIRST 1 OUTPUT Lhs.2, Lhs.1, Rhs.1, _
           9  ~12%    {4}    | REWRITE WITH Out.3 := true

     1853420   ~0%    {3} r2 = SCAN `DataFlowPrivate::nodeHasInstruction/3#f469bb06` OUTPUT In.1, In.0, In.2
      100282   ~0%    {3}    | JOIN WITH `Instruction::StoreInstruction.getDestinationAddressOperand/0#dispred#596a4aba` ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Lhs.2
      127910   ~0%    {6}    | JOIN WITH `DataFlowPrivate::numberOfLoadsFromOperand/4#7e555666_1023#join_rhs` ON FIRST 1 OUTPUT _, Lhs.1, Rhs.1, Rhs.3, Lhs.2, Rhs.2
      127910   ~0%    {4}    | REWRITE WITH Tmp.0 := 1, Out.0 := (Tmp.0 + In.4 + In.5) KEEPING 4
  4178182721   ~1%    {4}    | JOIN WITH `DataFlowUtil::FieldContent.getIndirectionIndex/0#dispred#cc69866f_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Lhs.2, Lhs.3
  4290552803   ~0%    {5}    | JOIN WITH `DataFlowUtil::FieldContent.getAField/0#dispred#ba1c91e5` ON FIRST 1 OUTPUT Lhs.2, Lhs.1, Lhs.3, Lhs.0, Rhs.1
  3033745816   ~5%    {7}    | JOIN WITH DataFlowUtil::PostFieldUpdateNode#b86f3a84_1023#join_rhs ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Lhs.2, Lhs.3, Lhs.4, Rhs.2, Rhs.3
  3033745816   ~3%    {9}    | JOIN WITH DataFlowUtil::TPostUpdateNodeImpl#f5e76b7a_21#join_rhs ON FIRST 1 OUTPUT Lhs.1, Lhs.2, Lhs.3, Lhs.4, Lhs.0, Lhs.5, Lhs.6, Rhs.1, _
                      {8}    | REWRITE WITH Tmp.8 := 1, TEST InOut.7 = Tmp.8 KEEPING 8
  1516872908   ~0%    {7}    | SCAN OUTPUT In.4, In.5, In.6, In.0, In.1, In.2, In.3
  2409090286   ~1%    {6}    | JOIN WITH DataFlowUtil::PostFieldUpdateNode#b86f3a84_0231#join_rhs ON FIRST 3 OUTPUT Rhs.3, Lhs.6, Lhs.3, Lhs.4, Lhs.5, Lhs.0
       66016  ~45%    {4}    | JOIN WITH `DataFlowUtil::FieldAddress.getField/0#dispred#bdd01c1a` ON FIRST 2 OUTPUT Lhs.2, Lhs.4, Lhs.5, Lhs.3

       66025  ~45%    {4} r3 = r1 UNION r2
                      return r3
```

Author: MathiasVP

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

@@ -861,6 +861,10 @@ predicate jumpStep(Node n1, Node n2) {
     n2.(FlowSummaryNode).getSummaryNode())
 }
 
+bindingset[c]
+pragma[inline_late]
+private int getIndirectionIndexLate(Content c) { result = c.getIndirectionIndex() }
+
 /**
  * Holds if data can flow from `node1` to `node2` via an assignment to `f`.
  * Thus, `node2` references an object with a field `f` that contains the
@@ -877,12 +881,13 @@ predicate storeStepImpl(Node node1, Content c, Node node2, boolean certain) {
   |
     postFieldUpdate = node2 and
     fc = c and
-    nodeHasInstruction(node1, store, pragma[only_bind_into](indirectionIndex1)) and
+    nodeHasInstruction(node1, pragma[only_bind_into](store),
+      pragma[only_bind_into](indirectionIndex1)) and
     postFieldUpdate.getIndirectionIndex() = 1 and
     numberOfLoadsFromOperand(postFieldUpdate.getFieldAddress(),
       store.getDestinationAddressOperand(), numberOfLoads, certain) and
     fc.getAField() = postFieldUpdate.getUpdatedField() and
-    fc.getIndirectionIndex() = 1 + indirectionIndex1 + numberOfLoads
+    getIndirectionIndexLate(fc) = 1 + indirectionIndex1 + numberOfLoads
   )
   or
   // models-as-data summarized flow
@@ -968,7 +973,7 @@ predicate readStep(Node node1, ContentSet c, Node node2) {
     nodeHasOperand(node1, fa1.getObjectAddressOperand(), 1) and
     numberOfLoadsFromOperand(fa1, operand, numberOfLoads, _) and
     fc.getAField() = fa1.getField() and
-    fc.getIndirectionIndex() = indirectionIndex2 + numberOfLoads
+    getIndirectionIndexLate(fc) = indirectionIndex2 + numberOfLoads
   )
   or
   // models-as-data summarized flow

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

@@ -2197,10 +2197,7 @@ class NonUnionFieldContent extends FieldContent, TNonUnionContent {
   override Field getAField() { result = f }
 
   /** Gets the indirection index of this `FieldContent`. */
-  pragma[inline]
-  override int getIndirectionIndex() {
-    pragma[only_bind_into](result) = pragma[only_bind_out](indirectionIndex)
-  }
+  override int getIndirectionIndex() { result = indirectionIndex }
 
   override predicate impliesClearOf(Content c) {
     exists(FieldContent fc |
@@ -2230,10 +2227,7 @@ class UnionContent extends FieldContent, TUnionContent {
   Union getUnion() { result = u }
 
   /** Gets the indirection index of this `UnionContent`. */
-  pragma[inline]
-  override int getIndirectionIndex() {
-    pragma[only_bind_into](result) = pragma[only_bind_out](indirectionIndex)
-  }
+  override int getIndirectionIndex() { result = indirectionIndex }
 
   override predicate impliesClearOf(Content c) {
     exists(UnionContent uc |
@@ -2257,10 +2251,7 @@ class ElementContent extends Content, TElementContent {
 
   ElementContent() { this = TElementContent(indirectionIndex) }
 
-  pragma[inline]
-  override int getIndirectionIndex() {
-    pragma[only_bind_into](result) = pragma[only_bind_out](indirectionIndex)
-  }
+  override int getIndirectionIndex() { result = indirectionIndex }
 
   override predicate impliesClearOf(Content c) { none() }