Revert "Eliminatable CheckMaps replaced with if(true) or if(false)."

src/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 295 matching lines @@
   const HBasicBlock* current = this;
   int result  = (current->IsLoopHeader()) ? 1 : 0;
   while (current->parent_loop_header() != NULL) {
     current = current->parent_loop_header();
     result++;
   }
   return result;
 }
 
 
-void HBasicBlock::ReplaceControlWithGotoSuccessor(int succ) {
-  ASSERT(IsFinished());
-  ASSERT(end()->SuccessorCount() == 2);  // Only this case is supported yet.
-  ASSERT(succ < end()->SuccessorCount());
-
-  int unreachable_succ = 1 - succ;
-
-  // Replace control instruction with if (true) {succ} else {unreachable_succ}.
-  HBranch* new_branch = HBranch::New(
-      zone(),
-      NULL,
-      graph()->GetConstantTrue(),
-      ToBooleanStub::Types(ToBooleanStub::BOOLEAN),
-      end()->SuccessorAt(succ),
-      end()->SuccessorAt(unreachable_succ));
-
-  MarkSuccEdgeUnreachable(unreachable_succ);
-
-  end()->DeleteAndReplaceWith(end()->ActualValue());
-  new_branch->InsertAfter(last());
-  end_ = new_branch;
-}
-
-
 void HBasicBlock::PostProcessLoopHeader(IterationStatement* stmt) {
   ASSERT(IsLoopHeader());
 
   SetJoinId(stmt->EntryId());
   if (predecessors()->length() == 1) {
     // This is a degenerated loop.
     DetachLoopInformation();
     return;
   }
 
   // Only the first entry into the loop is from outside the loop. All other
   // entries must be back edges.
   for (int i = 1; i < predecessors()->length(); ++i) {
     loop_information()->RegisterBackEdge(predecessors()->at(i));
   }
 }
 
 
-void HBasicBlock::MarkSuccEdgeUnreachable(int succ) {
-  ASSERT(IsFinished());
-  HBasicBlock* succ_block = end()->SuccessorAt(succ);
-
-  ASSERT(succ_block->predecessors()->length() == 1);
-  succ_block->MarkUnreachable();
-}
-
-
 void HBasicBlock::RegisterPredecessor(HBasicBlock* pred) {
   if (HasPredecessor()) {
     // Only loop header blocks can have a predecessor added after
     // instructions have been added to the block (they have phis for all
     // values in the environment, these phis may be eliminated later).
     ASSERT(IsLoopHeader() || first_ == NULL);
     HEnvironment* incoming_env = pred->last_environment();
     if (IsLoopHeader()) {
       ASSERT(phis()->length() == incoming_env->length());
       for (int i = 0; i < phis_.length(); ++i) {
@@ skipping 10564 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal