Temporary fix for OOM in precompilation with very large methods.

runtime/vm/redundancy_elimination.cc

Index: runtime/vm/redundancy_elimination.cc
diff --git a/runtime/vm/redundancy_elimination.cc b/runtime/vm/redundancy_elimination.cc
index 32fe07be391a6001033337bcfd889b56779c177e..f7bc9b77c655b6f49491380f6c4680d4f592d191 100644
--- a/runtime/vm/redundancy_elimination.cc
+++ b/runtime/vm/redundancy_elimination.cc
@@ -1549,6 +1549,15 @@ class LoadOptimizer : public ValueObject {
       FlowGraphPrinter::PrintGraph("Before LoadOptimizer", graph);
     }
 
+    // For now, bail out for large functions to avoid OOM situations.
+    // TODO(fschneider): Fix the memory consumption issue.
+    intptr_t function_length =
+        graph->function().end_token_pos().Pos() -
+        graph->function().token_pos().Pos();
+    if (function_length >= FLAG_huge_method_cutoff_in_tokens) {
+      return false;
+    }
+
     DirectChainedHashMap<PointerKeyValueTrait<Place> > map;
     AliasedSet* aliased_set = NumberPlaces(graph, &map, kOptimizeLoads);
     if ((aliased_set != NULL) && !aliased_set->IsEmpty()) {
@@ -2514,6 +2523,15 @@ class StoreOptimizer : public LivenessAnalysis {
       FlowGraphPrinter::PrintGraph("Before StoreOptimizer", graph);
     }
 
+    // For now, bail out for large functions to avoid OOM situations.
+    // TODO(fschneider): Fix the memory consumption issue.
+    intptr_t function_length =
+        graph->function().end_token_pos().Pos() -
+        graph->function().token_pos().Pos();
+    if (function_length >= FLAG_huge_method_cutoff_in_tokens) {
+      return;
+    }
+
     DirectChainedHashMap<PointerKeyValueTrait<Place> > map;
     AliasedSet* aliased_set = NumberPlaces(graph, &map, kOptimizeStores);
     if ((aliased_set != NULL) && !aliased_set->IsEmpty()) {