fix(es/renamer): Handle rest params correctly (#6821)

**Related issue:**

 - Closes #6819.

Author: kdy1

crates/swc_ecma_minifier/tests/mangle/issue-6819/1/input.js

@@ -0,0 +1,5 @@
+export function __CREATE_EXP__() {
+    return function EXP(...args) {
+        return value;
+    };
+}

crates/swc_ecma_minifier/tests/mangle/issue-6819/1/output.js

@@ -0,0 +1,5 @@
+export function __CREATE_EXP__() {
+    return function n(...r) {
+        return value;
+    };
+}

crates/swc_ecma_minifier/tests/mangle/issue-6819/2/input.js

@@ -0,0 +1,5 @@
+function __CREATE_EXP__(...args) {
+    return value;
+}
+
+export { }

crates/swc_ecma_minifier/tests/mangle/issue-6819/2/output.js

@@ -0,0 +1,4 @@
+function e(...n) {
+    return value;
+}
+export { };

crates/swc_ecma_minifier/tests/terser/compress/expansions/avoid_spread_in_ternary/output.mangleOnly.js

@@ -1,5 +1,5 @@
-function e(...e) {
-    console.log(...e);
+function e(...o) {
+    console.log(...o);
 }
 var o = [
     1,

crates/swc_ecma_minifier/tests/terser/compress/harmony/expansion/output.mangleOnly.js

@@ -1,3 +1,3 @@
-function o(o, ...n) {
-    console.log(o);
+function o(n, ...c) {
+    console.log(n);
 }

crates/swc_ecma_transforms_base/src/rename/analyzer/mod.rs

@@ -270,7 +270,17 @@ impl Visit for Analyzer {
     fn visit_fn_decl(&mut self, f: &FnDecl) {
         self.add_decl(f.ident.to_id(), true);
 
+        // https://github.com/swc-project/swc/issues/6819
+        let has_rest = f.function.params.iter().any(|p| p.pat.is_rest());
+        if has_rest {
+            self.add_usage(f.ident.to_id());
+        }
+
         self.with_fn_scope(|v| {
+            if has_rest {
+                v.add_usage(f.ident.to_id());
+            }
+
             f.function.decorators.visit_with(v);
             f.function.params.visit_with(v);
             // WARN: Option<BlockStmt>::visit_mut_children_wth
@@ -284,6 +294,11 @@ impl Visit for Analyzer {
             self.with_fn_scope(|v| {
                 v.add_decl(id.to_id(), true);
                 v.with_fn_scope(|v| {
+                    // https://github.com/swc-project/swc/issues/6819
+                    if f.function.params.iter().any(|p| p.pat.is_rest()) {
+                        v.add_usage(id.to_id());
+                    }
+
                     f.function.decorators.visit_with(v);
                     f.function.params.visit_with(v);
                     v.visit_fn_body_within_same_scope(&f.function.body);