[tickprocessor] Consider top of the stack as pc if it points to a code object.

tools/tickprocessor.js

Index: tools/tickprocessor.js
diff --git a/tools/tickprocessor.js b/tools/tickprocessor.js
index 91b5436eb5432fc3112c1a445d504435f10ad60d..af2e8f63d2d2451c96e0808c045d4f831fc895f9 100644
--- a/tools/tickprocessor.js
+++ b/tools/tickprocessor.js
@@ -365,7 +365,7 @@ TickProcessor.prototype.processTick = function(pc,
     // Find out, if top of stack was pointing inside a JS function
     // meaning that we have encountered a frameless invocation.
     var funcEntry = this.profile_.findEntry(tos_or_external_callback);
-    if (!funcEntry || !funcEntry.isJSFunction || !funcEntry.isJSFunction()) {
+    if (!funcEntry) {
       tos_or_external_callback = 0;
     }
   }