Add the forceCompile param to _getSourceReport.

runtime/vm/source_report.cc

Index: runtime/vm/source_report.cc
diff --git a/runtime/vm/source_report.cc b/runtime/vm/source_report.cc
index 4da21b6e8a350f7cbe4fc5e918b271d8af71d95c..8c08726353de2cbbd98bd5fc0ee493a12c143f9e 100644
--- a/runtime/vm/source_report.cc
+++ b/runtime/vm/source_report.cc
@@ -244,6 +244,15 @@ void SourceReport::VisitFunction(JSONArray* jsarr, const Function& func) {
   }
   ASSERT(!code.IsNull());
 
+  // We skip compiled async functions.  Once an async function has
+  // been compiled, there is another function with the same range which
+  // actually contains the user code.
+  if (func.IsAsyncFunction() ||
+      func.IsAsyncGenerator() ||
+      func.IsSyncGenerator()) {
+    return;
+  }
+
   JSONObject range(jsarr);
   range.AddProperty("scriptIndex", GetScriptIndex(script));
   range.AddProperty("startPos", begin_pos);