Add WasmFrame, backtraces reflect wasm's presence

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 d4b72c00856482a527cb5e12c607a8ffee2aa6db..900baaac0187a571cbd9f668a309a9b956d0ca2d 100644
--- a/test/mjsunit/wasm/stack.js
+++ b/test/mjsunit/wasm/stack.js
@@ -62,8 +62,11 @@ function check_STACK() {
 var expected = "Error\n" +
     // The line numbers below will change as this test gains / loses lines..
     "    at STACK (stack.js:54:11)\n" +  // --
+    "    at Function.<WASM> (<anonymous>)\n" +  // --

[titzer, 2016/02/19 10:50:30]

This shows the two wrappers (into and out of JS), which is OK for now, but we'll
need to add a TODO somewhere to filter them out.

[JF, 2016/02/19 16:53:58]

Yeah the JS frame handling does:

          // Filter out internal frames that we do not want to show.
          if (!IsVisibleInStackTrace(*fun, *caller, *recv, &seen_caller))
            continue;

Once I pipe the metadata through that will be obvious :-)

+    "    at Function.<WASM> (<anonymous>)\n" +  // --
+    "    at Function.<WASM> (<anonymous>)\n" +  // --
     "    at testStack (stack.js:43:10)\n" +
     // TODO(jfb) Add WebAssembly stack here.
-    "    at stack.js:69:1";
+    "    at stack.js:72:1";
 
 testStack(STACK, check_STACK);