Disable range analysis. Causes timeouts on dart2js buildbots.

runtime/vm/compiler.cc

 // Copyright (c) 2012, 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/compiler.h"
 
 #include "vm/assembler.h"
 #include "vm/ast_printer.h"
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 28 matching lines @@
     "Do conditional constant propagation/unreachable code elimination.");
 DEFINE_FLAG(bool, common_subexpression_elimination, true,
     "Do common subexpression elimination.");
 DEFINE_FLAG(bool, loop_invariant_code_motion, true,
     "Do loop invariant code motion.");
 DEFINE_FLAG(bool, propagate_types, true, "Do static type propagation.");
 DEFINE_FLAG(int, deoptimization_counter_threshold, 5,
     "How many times we allow deoptimization before we disallow"
     " certain optimizations");
 DEFINE_FLAG(bool, use_inlining, true, "Enable call-site inlining");
+DEFINE_FLAG(bool, range_analysis, false, "Enable range analysis");
 DECLARE_FLAG(bool, print_flow_graph);
 
 
 // Compile a function. Should call only if the function has not been compiled.
 //   Arg0: function object.
 DEFINE_RUNTIME_ENTRY(CompileFunction, 1) {
   ASSERT(arguments.Count() == kCompileFunctionRuntimeEntry.argument_count());
   const Function& function = Function::CheckedHandle(arguments.At(0));
   ASSERT(!function.HasCode());
   const Error& error = Error::Handle(Compiler::CompileFunction(function));
@@ skipping 150 matching lines @@
         if (FLAG_constant_propagation) {
           ConstantPropagator::Optimize(flow_graph);
         }
         if (FLAG_common_subexpression_elimination) {
           DominatorBasedCSE::Optimize(flow_graph);
         }
         if (FLAG_loop_invariant_code_motion) {
           LICM::Optimize(flow_graph);
         }
 
-        // We have to perform range analysis after LICM because it
-        // optimistically moves CheckSmi through phis into loop preheaders
-        // making some phis smi.
-        flow_graph->ComputeUseLists();
-        optimizer.InferSmiRanges();
+        if (FLAG_range_analysis) {
+          // We have to perform range analysis after LICM because it
+          // optimistically moves CheckSmi through phis into loop preheaders
+          // making some phis smi.
+          flow_graph->ComputeUseLists();
+          optimizer.InferSmiRanges();
+        }
 
         // Perform register allocation on the SSA graph.
         FlowGraphAllocator allocator(*flow_graph);
         allocator.AllocateRegisters();
 
         if (FLAG_print_flow_graph) {
           OS::Print("After Optimizations:\n");
           FlowGraphPrinter printer(*flow_graph);
           printer.PrintBlocks();
         }
@@ skipping 345 matching lines @@
     result = isolate->object_store()->sticky_error();
     isolate->object_store()->clear_sticky_error();
     isolate->set_long_jump_base(base);
     return result.raw();
   }
   UNREACHABLE();
   return Object::null();
 }
 
 }  // namespace dart