Fix Observatory crash for DBC

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 ac162492f96c2759da5fca81917fbf09ed17224c..66ae9bd5061e187ee77dcd2ce0ef1d3feff11f1a 100644
--- a/runtime/vm/source_report.cc
+++ b/runtime/vm/source_report.cc
@@ -145,6 +145,14 @@ void SourceReport::PrintCallSitesData(JSONObject* jsobj,
       RawPcDescriptors::kIcCall | RawPcDescriptors::kUnoptStaticCall);
   while (iter.MoveNext()) {
     HANDLESCOPE(thread());
+    // TODO(zra): Remove this bailout once DBC has reliable ICData.
+#if defined(TARGET_ARCH_DBC)
+    if (iter.DeoptId() >= ic_data_array->length()) {
+      continue;
+    }
+#else
+    ASSERT(iter.DeoptId() < ic_data_array->length());
+#endif
     const ICData* ic_data = (*ic_data_array)[iter.DeoptId()];
     if (ic_data != NULL) {
       const TokenPosition token_pos = iter.TokenPos();
@@ -158,6 +166,7 @@ void SourceReport::PrintCallSitesData(JSONObject* jsobj,
   }
 }
 
+
 void SourceReport::PrintCoverageData(JSONObject* jsobj,
                                      const Function& function,
                                      const Code& code) {
@@ -186,6 +195,14 @@ void SourceReport::PrintCoverageData(JSONObject* jsobj,
       RawPcDescriptors::kIcCall | RawPcDescriptors::kUnoptStaticCall);
   while (iter.MoveNext()) {
     HANDLESCOPE(thread());
+    // TODO(zra): Remove this bailout once DBC has reliable ICData.
+#if defined(TARGET_ARCH_DBC)
+    if (iter.DeoptId() >= ic_data_array->length()) {
+      continue;
+    }
+#else
+    ASSERT(iter.DeoptId() < ic_data_array->length());
+#endif
     const ICData* ic_data = (*ic_data_array)[iter.DeoptId()];
     if (ic_data != NULL) {
       const TokenPosition token_pos = iter.TokenPos();