Big merge from experimental to bleeding edge.

sdk/lib/_internal/compiler/implementation/ssa/value_set.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/value_set.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ssa/value_set.dart b/sdk/lib/_internal/compiler/implementation/ssa/value_set.dart
index b68e688763f0cb47faf37f249664913b5003a409..d565de77ebd143750ce61d9d0e15ff5a3ac62b11 100644
--- a/sdk/lib/_internal/compiler/implementation/ssa/value_set.dart
+++ b/sdk/lib/_internal/compiler/implementation/ssa/value_set.dart
@@ -8,7 +8,7 @@ class ValueSet {
   int size = 0;
   List<HInstruction> table;
   ValueSetNode collisions;
-  ValueSet() : table = new List<HInstruction>(8);
+  ValueSet() : table = new List<HInstruction>.fixedLength(8);
 
   bool get isEmpty => size == 0;
   int get length => size;
@@ -137,7 +137,7 @@ class ValueSet {
     // Reset the table with a bigger capacity.
     assert(capacity > table.length);
     size = 0;
-    table = new List<HInstruction>(capacity);
+    table = new List<HInstruction>.fixedLength(capacity);
     collisions = null;
     // Add the old instructions to the new table.
     copyTo(this, oldTable, oldCollisions);