Generate unique names for $jscomp$arguments variables to preserve normalization

This enables preserving normalization (i.e. globally unique names) even when we move this pass post-normalization.

PiperOrigin-RevId: 623357035

Author: rishipal

src/com/google/javascript/jscomp/Es6RewriteArrowFunction.java

@@ -137,7 +137,8 @@ private void addVarDeclarations(NodeTraversal t, ThisAndArgumentsContext context
     }
 
     if (context.needsArgumentsVar) {
-      Node argumentsVar = astFactory.createArgumentsAliasDeclaration(ARGUMENTS_VAR);
+      Node argumentsVar =
+          astFactory.createArgumentsAliasDeclaration(ARGUMENTS_VAR + "$" + context.uniqueId);
       NodeUtil.addFeatureToScript(t.getCurrentScript(), Feature.CONST_DECLARATIONS, compiler);
       scopeBody.addChildToFront(argumentsVar);
 
@@ -248,7 +249,10 @@ public void visit(NodeTraversal t, Node n, Node parent) {
       } else if (n.isName() && n.getString().equals("arguments")) {
         context.setNeedsArgumentsVar();
 
-        Node name = astFactory.createName(ARGUMENTS_VAR, AstFactory.type(n)).srcref(n);
+        Node name =
+            astFactory
+                .createName(ARGUMENTS_VAR + "$" + context.uniqueId, AstFactory.type(n))
+                .srcref(n);
         if (compiler.getOptions().preservesDetailedSourceInfo()) {
           name.setOriginalName("arguments");
         }

test/com/google/javascript/jscomp/CodePrinterTest.java

@@ -3845,7 +3845,7 @@ public void testEs6ArrowFunctionSetsOriginalNameForArguments() {
     String code = "(x)=>{arguments[0]();}";
     String expectedCode =
         ""
-            + "var $jscomp$arguments = arguments;\n"
+            + "var $jscomp$arguments$3556498$0 = arguments;\n"
             + "(function(x) {\n"
             + "  arguments[0]();\n"
             + "});\n";

test/com/google/javascript/jscomp/Es6RewriteArrowFunctionTest.java

@@ -198,8 +198,8 @@ public void testCapturingEnclosingFunctionArgumentsInArrow() {
         lines("function f() {", "  var x = () => arguments;", "}"),
         lines(
             "function f() {",
-            "  const $jscomp$arguments = arguments;",
-            "  var x = function() { return $jscomp$arguments; };",
+            "  const $jscomp$arguments$m1146332801$1 = arguments;",
+            "  var x = function() { return $jscomp$arguments$m1146332801$1; };",
             "}"));
   }