test(es/transforms): Add a test for reserved_words pass (#8638)

**Related issue:**

 - Closes #7691

Author: kdy1

crates/swc/tests/fixture/issues-7xxx/7691/input/.swcrc

@@ -0,0 +1,19 @@
+{
+    "jsc": {
+        "parser": {
+            "syntax": "ecmascript",
+            "jsx": true
+        },
+        "target": "es3",
+        "loose": false,
+        "minify": {
+            "compress": false,
+            "mangle": false
+        }
+    },
+    "module": {
+        "type": "es6"
+    },
+    "minify": false,
+    "isModule": true,
+}

crates/swc/tests/fixture/issues-7xxx/7691/input/1.js

@@ -0,0 +1 @@
+export var int = 1

crates/swc/tests/fixture/issues-7xxx/7691/output/1.js

@@ -0,0 +1,2 @@
+var _int = 1;
+export { _int as int };