Add another test case to check determinism

Author: aheejin

test/lit/source-map-names.wast

@@ -5,10 +5,11 @@
 ;; After --remove-unused-module-elements, the output source map's 'names' field
 ;; should NOT contain 'unused'
 
-;; OUT-MAP: "names":["used"]
+;; OUT-MAP: "names":["used","used2"]
 
 (module
   (export "used" (func $used))
+  (export "used2" (func $used2))
 
   (func $unused
     ;;@ src.cpp:1:1:unused
@@ -21,4 +22,11 @@
     ;;@ src.cpp:2:1:used
     (nop)
   )
+
+  (func $used2
+    ;; OUT-WAST:      ;;@ src.cpp:3:1:used
+    ;; OUT-WAST-NEXT: (nop)
+    ;;@ src.cpp:3:1:used2
+    (nop)
+  )
 )