Replace guarded list length field loads with constants

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
diff --git a/runtime/vm/intermediate_language.cc b/runtime/vm/intermediate_language.cc
index b681cd70f7edf22162f8a9226765859c265c4a7c..700a3b5195d3fcf08deb02179cfd9b7c9a7edfb6 100644
--- a/runtime/vm/intermediate_language.cc
+++ b/runtime/vm/intermediate_language.cc
@@ -2519,6 +2519,11 @@ bool CheckArrayBoundInstr::IsRedundant(RangeBoundary length) {
     return false;
   }
 
+  intptr_t known_array_length = GetGuardedArrayLength();
+  if (max.UpperBound().value() < known_array_length) {

[srdjan, 2013/08/27 15:50:33]

How about "max.UpperBound().value() < GetGuardedArrayLength()"?

+    return true;
+  }
+
   // Try to compare constant boundaries.
   if (max.UpperBound().value() < length.LowerBound().value()) {
     return true;