Handle stack frames differently inside and on the boundary of wasm.

test/mjsunit/wasm/stack.js

Index: test/mjsunit/wasm/stack.js
diff --git a/test/mjsunit/wasm/stack.js b/test/mjsunit/wasm/stack.js
index 573db3032b96142363eb87bbe67b3c2f7a84ff5c..379d3778ee91f00bce678d85967bc7e608fb9089 100644
--- a/test/mjsunit/wasm/stack.js
+++ b/test/mjsunit/wasm/stack.js
@@ -63,10 +63,8 @@ var expected = "Error\n" +
     // The line numbers below will change as this test gains / loses lines..
     "    at STACK (stack.js:54:11)\n" +  // --
     "    at <WASM> (<anonymous>)\n" +  // --
-    "    at <WASM> (<anonymous>)\n" +  // --
-    "    at <WASM> (<anonymous>)\n" +  // --
     "    at testStack (stack.js:43:10)\n" +
     // TODO(jfb) Add WebAssembly stack here.
-    "    at stack.js:72:1";
+    "    at stack.js:70:1";
 
 testStack(STACK, check_STACK);