[vm] Add error messages for large literals coming from kernel

runtime/vm/kernel_binary_flowgraph.cc

Index: runtime/vm/kernel_binary_flowgraph.cc
diff --git a/runtime/vm/kernel_binary_flowgraph.cc b/runtime/vm/kernel_binary_flowgraph.cc
index 34a20248b9bb9d8047dbf2d32c18c374395226b6..0fbefa90cd37274879f9ff6e578aec39df4b9998 100644
--- a/runtime/vm/kernel_binary_flowgraph.cc
+++ b/runtime/vm/kernel_binary_flowgraph.cc
@@ -2267,6 +2267,9 @@ void StreamingConstantEvaluator::EvaluateBigIntLiteral() {
   const dart::String& value =
       H.DartString(builder_->ReadStringReference());  // read string reference.
   result_ = Integer::New(value, Heap::kOld);
+  if (result_.IsNull()) {
+    H.ReportError("Integer literal %s is out of range", value.ToCString());

[zra, 2017/07/27 16:31:44]

If code after ReportError is unreachable, it can be helpful to put an
UNREACHABLE() after.

[alexmarkov, 2017/07/28 17:42:43]

Done.

+  }
   result_ = H.Canonicalize(result_);
 }
 
@@ -5774,7 +5777,12 @@ Fragment StreamingFlowGraphBuilder::BuildBigIntLiteral(
 
   const dart::String& value =
       H.DartString(ReadStringReference());  // read index into string table.
-  return Constant(Integer::ZoneHandle(Z, Integer::New(value, Heap::kOld)));
+  const Integer& integer =
+      Integer::ZoneHandle(Z, Integer::New(value, Heap::kOld));
+  if (integer.IsNull()) {
+    H.ReportError("Integer literal %s is out of range", value.ToCString());
+  }
+  return Constant(integer);
 }
 
 Fragment StreamingFlowGraphBuilder::BuildStringLiteral(