fix(es/minifier): Only merge last if return (#9633)

**Related issue:**
 - Closes #9628

.changeset/good-lions-design.md

@@ -0,0 +1,6 @@
+---
+swc_core: patch
+swc_ecma_minifier: patch
+---
+
+fix(es/minifier): Only merge last if return

crates/swc_ecma_minifier/src/compress/optimize/if_return.rs

@@ -494,16 +494,16 @@ impl Optimizer<'_> {
         }
     }
 
-    fn can_merge_stmt_as_if_return(&self, s: &Stmt, _is_last: bool) -> bool {
+    fn can_merge_stmt_as_if_return(&self, s: &Stmt, is_last: bool) -> bool {
         // if !res {
         //     trace!("Cannot merge: {}", dump(s));
         // }
 
         match s {
             Stmt::Expr(..) => true,
-            Stmt::Return(..) => true,
+            Stmt::Return(..) => is_last,
             Stmt::Block(s) => {
-                s.stmts.len() == 1 && self.can_merge_stmt_as_if_return(&s.stmts[0], false)
+                s.stmts.len() == 1 && self.can_merge_stmt_as_if_return(&s.stmts[0], is_last)
             }
             Stmt::If(stmt) => {
                 matches!(&*stmt.cons, Stmt::Return(..))

crates/swc_ecma_minifier/tests/fixture/issues/9628/input.js

@@ -0,0 +1,11 @@
+const getString = () => {
+    switch ("apple") {
+        case "apple":
+            return "1";
+        case "banana":
+            return "2";
+    }
+    return "3";
+};
+
+console.log(getString());

crates/swc_ecma_minifier/tests/fixture/issues/9628/output.js

@@ -0,0 +1 @@
+console.log("1");