Propagate exceptions thrown when setting elements.

src/handles.cc

Index: src/handles.cc
diff --git a/src/handles.cc b/src/handles.cc
index 274c34ddebaf24283d1f0d1d21a5f9217dc469d2..795eda073c18e44244093ccc8a88785285d9015a 100644
--- a/src/handles.cc
+++ b/src/handles.cc
@@ -808,6 +808,7 @@ static bool CompileLazyHelper(CompilationInfo* info,
                               ClearExceptionFlag flag) {
   // Compile the source information to a code object.
   ASSERT(info->IsOptimizing() || !info->shared_info()->is_compiled());
+  ASSERT(!Top::has_pending_exception());
   bool result = Compiler::CompileLazy(info);
   ASSERT(result != Top::has_pending_exception());
   if (!result && flag == CLEAR_EXCEPTION) Top::clear_pending_exception();