Cleanup: use a ZoneGrowableArray instead of Array for ICData map.

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
===================================================================
--- runtime/vm/intermediate_language.cc	(revision 37378)
+++ runtime/vm/intermediate_language.cc	(working copy)
@@ -59,14 +59,14 @@
 }
 
 
-ICData* Instruction::GetICData(const Array& ic_data_array) const {
-  ICData& ic_data = ICData::ZoneHandle();
+const ICData* Instruction::GetICData(
+    const ZoneGrowableArray<const ICData*>& ic_data_array) const {
   // The deopt_id can be outside the range of the IC data array for
   // computations added in the optimizing compiler.
-  if (!ic_data_array.IsNull() && (deopt_id_ < ic_data_array.Length())) {
-    ic_data ^= ic_data_array.At(deopt_id_);
+  if (deopt_id_ < ic_data_array.length()) {
+    return ic_data_array[deopt_id_];
   }
-  return &ic_data;
+  return NULL;
 }