Ruby: Remove isSplatAll arg/parameter position

This is equivalent to isSplat(0).

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

@@ -438,7 +438,6 @@ private module Cached {
       FlowSummaryImplSpecific::ParsePositions::isParsedKeywordParameterPosition(_, name)
     } or
     THashSplatArgumentPosition() or
-    TSplatAllArgumentPosition() or
     TSplatArgumentPosition(int pos) { exists(Call c | c.getArgument(pos) instanceof SplatExpr) } or
     TSynthSplatArgumentPosition() or
     TAnyArgumentPosition() or
@@ -469,7 +468,6 @@ private module Cached {
     // position for multiple parameter nodes in the same callable, we introduce this
     // synthetic parameter position.
     TSynthHashSplatParameterPosition() or
-    TSplatAllParameterPosition() or
     TSplatParameterPosition(int pos) {
       exists(Parameter p | p.getPosition() = pos and p instanceof SplatParameter)
     } or
@@ -1300,8 +1298,6 @@ class ParameterPosition extends TParameterPosition {
   // A fake position to indicate that this parameter node holds content from a synth arg splat node
   predicate isSynthArgSplat() { this = TSynthArgSplatParameterPosition() }
 
-  predicate isSplatAll() { this = TSplatAllParameterPosition() }
-
   predicate isSplat(int n) { this = TSplatParameterPosition(n) }
 
   /**
@@ -1329,8 +1325,6 @@ class ParameterPosition extends TParameterPosition {
     or
     this.isSynthHashSplat() and result = "synthetic **"
     or
-    this.isSplatAll() and result = "*"
-    or
     this.isAny() and result = "any"
     or
     this.isAnyNamed() and result = "any-named"
@@ -1372,8 +1366,6 @@ class ArgumentPosition extends TArgumentPosition {
    */
   predicate isHashSplat() { this = THashSplatArgumentPosition() }
 
-  predicate isSplatAll() { this = TSplatAllArgumentPosition() }
-
   predicate isSplat(int n) { this = TSplatArgumentPosition(n) }
 
   predicate isSynthSplat() { this = TSynthSplatArgumentPosition() }
@@ -1394,8 +1386,6 @@ class ArgumentPosition extends TArgumentPosition {
     or
     this.isHashSplat() and result = "**"
     or
-    this.isSplatAll() and result = "*"
-    or
     this.isSynthSplat() and result = "synthetic *"
     or
     exists(int pos | this.isSplat(pos) and result = "* (position " + pos + ")")
@@ -1427,11 +1417,9 @@ predicate parameterMatch(ParameterPosition ppos, ArgumentPosition apos) {
   or
   ppos.isSynthHashSplat() and apos.isHashSplat()
   or
-  ppos.isSplatAll() and apos.isSplatAll()
+  ppos.isSplat(0) and apos.isSynthSplat()
   or
-  ppos.isSplatAll() and apos.isSynthSplat()
-  or
-  ppos.isSynthSplat() and apos.isSplatAll()
+  ppos.isSynthSplat() and apos.isSplat(0)
   or
   apos.isSynthSplat() and ppos.isSynthArgSplat()
   or

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

@@ -245,12 +245,7 @@ private class Argument extends CfgNodes::ExprCfgNode {
     this.getExpr() instanceof HashSplatExpr and
     arg.isHashSplat()
     or
-    this = call.getArgument(0) and
-    not exists(call.getArgument(1)) and
-    this.getExpr() instanceof SplatExpr and
-    arg.isSplatAll()
-    or
-    exists(int pos | pos > 0 or exists(call.getArgument(pos + 1)) |
+    exists(int pos |
       this = call.getArgument(pos) and
       this.getExpr() instanceof SplatExpr and
       arg.isSplat(pos)
@@ -370,9 +365,7 @@ private module Cached {
     } or
     TSynthSplatArgumentNode(CfgNodes::ExprNodes::CallCfgNode c) {
       exists(Argument arg, ArgumentPosition pos | pos.isPositional(_) | arg.isArgumentOf(c, pos)) and
-      not exists(Argument arg, ArgumentPosition pos | pos.isSplat(_) or pos.isSplatAll() |
-        arg.isArgumentOf(c, pos)
-      )
+      not exists(Argument arg, ArgumentPosition pos | pos.isSplat(_) | arg.isArgumentOf(c, pos))
     }
 
   class TSourceParameterNode =
@@ -695,11 +688,7 @@ private module ParameterNodes {
         parameter = callable.getAParameter().(HashSplatParameter) and
         pos.isHashSplat()
         or
-        parameter = callable.getParameter(0).(SplatParameter) and
-        not exists(callable.getParameter(1)) and
-        pos.isSplatAll()
-        or
-        exists(int n | n > 0 |
+        exists(int n |
           parameter = callable.getParameter(n).(SplatParameter) and
           pos.isSplat(n) and
           // There are no positional parameters after the splat