fix more getAstNode/injects replacement.

Author: aschackmull

ruby/ql/lib/codeql/ruby/dataflow/internal/DataFlowPrivate.qll

@@ -95,7 +95,7 @@ CfgNodes::ExprCfgNode getPostUpdateReverseStep(CfgNodes::ExprCfgNode e) {
 pragma[nomagic]
 Ssa::Definition getParameterDef(NamedParameter p) {
   exists(BasicBlock bb, int i |
-    bb.getNode(i).getAstNode() = p.getDefiningAccess() and
+    bb.getNode(i).injects(p.getDefiningAccess()) and
     result.definesAt(_, bb, i)
   )
 }

ruby/ql/lib/codeql/ruby/dataflow/internal/SsaImpl.qll

@@ -179,7 +179,7 @@ private predicate capturedCallRead(CallCfgNode call, Cfg::BasicBlock bb, int i,
 private predicate variableReadActual(Cfg::BasicBlock bb, int i, LocalVariable v) {
   exists(VariableReadAccess read |
     read.getVariable() = v and
-    read = bb.getNode(i).getAstNode()
+    bb.getNode(i).injects(read)
   )
 }
 
@@ -396,7 +396,7 @@ class NormalParameter extends Parameter {
 pragma[nomagic]
 Definition getParameterDef(NamedParameter p) {
   exists(Cfg::BasicBlock bb, int i |
-    bb.getNode(i).getAstNode() = p.getDefiningAccess() and
+    bb.getNode(i).injects(p.getDefiningAccess()) and
     result.definesAt(_, bb, i)
   )
 }