JS: brought back isGlobal predicate in RegExpCreationNode and added maybeGlobal for more convenience.

Author: Napalys

javascript/ql/lib/semmle/javascript/StandardLibrary.qll

@@ -115,17 +115,13 @@ class StringReplaceCall extends DataFlow::MethodCallNode {
    * Holds if this is a global replacement, that is, the first argument is a regular expression
    * with the `g` flag, or this is a call to `.replaceAll()`.
    */
-  predicate isGlobal() {
-    RegExp::isGlobal(this.getRegExp().getFlags()) or this.getMethodName() = "replaceAll"
-  }
+  predicate isGlobal() { this.getRegExp().isGlobal() or this.getMethodName() = "replaceAll" }
 
   /**
    * Holds if this is a global replacement, that is, the first argument is a regular expression
    * with the `g` flag or unknown flags, or this is a call to `.replaceAll()`.
    */
-  predicate maybeGlobal() {
-    RegExp::maybeGlobal(this.getRegExp().tryGetFlags()) or this.getMethodName() = "replaceAll"
-  }
+  predicate maybeGlobal() { this.getRegExp().maybeGlobal() or this.getMethodName() = "replaceAll" }
 
   /**
    * Holds if this call to `replace` replaces `old` with `new`.

javascript/ql/lib/semmle/javascript/dataflow/Nodes.qll

@@ -1682,6 +1682,12 @@ class RegExpCreationNode extends DataFlow::SourceNode {
     result = this.(RegExpLiteralNode).getFlags()
   }
 
+  /** Holds if the constructed predicate has the `g` flag. */
+  predicate isGlobal() { RegExp::isGlobal(this.getFlags()) }
+
+  /** Holds if the constructed predicate has the `g` flag or unknown flags. */
+  predicate maybeGlobal() { RegExp::isGlobal(this.tryGetFlags()) }
+
   /** Gets a data flow node referring to this regular expression. */
   private DataFlow::SourceNode getAReference(DataFlow::TypeTracker t) {
     t.start() and