Temporary disable string-interpolation constant folding until failures witj --optimization-counter-…

runtime/vm/flow_graph_optimizer.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/flow_graph_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_builder.h"
@@ skipping 6199 matching lines @@
 }
 
 
 void ConstantPropagator::VisitStringFromCharCode(
     StringFromCharCodeInstr* instr) {
   SetValue(instr, non_constant_);
 }
 
 
 void ConstantPropagator::VisitStringInterpolate(StringInterpolateInstr* instr) {
+  // TODO(srdjan): Remove the code below and enable constant folding once
+  // issue resolved.
+  SetValue(instr, non_constant_);
+  return;
+
   if (IsNonConstant(instr->constant_value())) {
     // Do not bother with costly analysis if we already know that the
     // instruction is not a constant.
     SetValue(instr, non_constant_);
     return;
   }
   // If all inputs are constant strings, numbers, booleans or null, then
   // constant fold.
   // TODO(srdjan): Also constant fold an interval of constant arguments.
   //   v2 <- CreateArray(v0)
@@ skipping 1518 matching lines @@
   }
 
   // Insert materializations at environment uses.
   for (intptr_t i = 0; i < exits.length(); i++) {
     CreateMaterializationAt(exits[i], alloc, alloc->cls(), *fields);
   }
 }
 
 
 }  // namespace dart