VM: [Kernel] Relax assertion in SSA construction.

runtime/vm/flow_graph.cc

Index: runtime/vm/flow_graph.cc
diff --git a/runtime/vm/flow_graph.cc b/runtime/vm/flow_graph.cc
index fdf1d2e189ac9dd7ce2bb4aa13b307d312e64f07..4eb78fa1c45086e2b268e62b565709f38d45ee23 100644
--- a/runtime/vm/flow_graph.cc
+++ b/runtime/vm/flow_graph.cc
@@ -1154,8 +1154,9 @@ void FlowGraph::RenameRecursive(BlockEntryInstr* block_entry,
           }
           ASSERT((drop->value() != NULL) || !drop->HasTemp());
         } else {
-          ASSERT(definition->HasTemp());
-          result = GetConstant(constant->value());
+          if (definition->HasTemp()) {
+            result = GetConstant(constant->value());
+          }
         }
         // Update expression stack or remove from graph.
         if (definition->HasTemp()) {