Revert "Initial shot at deoptimizing JSCallFunction in Turbofan."

src/compiler/register-allocator.cc

Index: src/compiler/register-allocator.cc
diff --git a/src/compiler/register-allocator.cc b/src/compiler/register-allocator.cc
index 972a9045094a22ed2ceb355f0664e35b29201d6a..46446aa5622987aab52c395c6985b2b958b95630 100644
--- a/src/compiler/register-allocator.cc
+++ b/src/compiler/register-allocator.cc
@@ -744,70 +744,6 @@ void RegisterAllocator::MeetRegisterConstraints(BasicBlock* block) {
       if (!AllocationOk()) return;
     }
   }
-
-  // Meet register constraints for the instruction in the end.
-  if (!code()->IsGapAt(end)) {
-    MeetRegisterConstraintsForLastInstructionInBlock(block);
-  }
-}
-
-
-void RegisterAllocator::MeetRegisterConstraintsForLastInstructionInBlock(
-    BasicBlock* block) {
-  int end = block->last_instruction_index();
-  Instruction* last_instruction = InstructionAt(end);
-  for (size_t i = 0; i < last_instruction->OutputCount(); i++) {
-    InstructionOperand* output_operand = last_instruction->OutputAt(i);
-    DCHECK(!output_operand->IsConstant());
-    UnallocatedOperand* output = UnallocatedOperand::cast(output_operand);
-    int output_vreg = output->virtual_register();
-    LiveRange* range = LiveRangeFor(output_vreg);
-    bool assigned = false;
-    if (output->HasFixedPolicy()) {
-      AllocateFixed(output, -1, false);
-      // This value is produced on the stack, we never need to spill it.
-      if (output->IsStackSlot()) {
-        range->SetSpillOperand(output);
-        range->SetSpillStartIndex(end);
-        assigned = true;
-      }
-
-      BasicBlock::Successors successors = block->successors();
-      for (BasicBlock::Successors::iterator succ = successors.begin();
-           succ != successors.end(); ++succ) {
-        DCHECK((*succ)->PredecessorCount() == 1);
-        int gap_index = (*succ)->first_instruction_index() + 1;
-        DCHECK(code()->IsGapAt(gap_index));
-
-        // Create an unconstrained operand for the same virtual register
-        // and insert a gap move from the fixed output to the operand.
-        UnallocatedOperand* output_copy =
-            new (code_zone()) UnallocatedOperand(UnallocatedOperand::ANY);
-        output_copy->set_virtual_register(output_vreg);
-
-        code()->AddGapMove(gap_index, output, output_copy);
-      }
-    }
-
-    if (!assigned) {
-      BasicBlock::Successors successors = block->successors();
-      for (BasicBlock::Successors::iterator succ = successors.begin();
-           succ != successors.end(); ++succ) {
-        DCHECK((*succ)->PredecessorCount() == 1);
-        int gap_index = (*succ)->first_instruction_index() + 1;
-        range->SetSpillStartIndex(gap_index);
-
-        // This move to spill operand is not a real use. Liveness analysis
-        // and splitting of live ranges do not account for it.
-        // Thus it should be inserted to a lifetime position corresponding to
-        // the instruction end.
-        GapInstruction* gap = code()->GapAt(gap_index);
-        ParallelMove* move =
-            gap->GetOrCreateParallelMove(GapInstruction::BEFORE, code_zone());
-        move->AddMove(output, range->GetSpillOperand(), code_zone());
-      }
-    }
-  }
 }
 
 
@@ -850,8 +786,6 @@ void RegisterAllocator::MeetConstraintsBetween(Instruction* first,
           code()->AddGapMove(gap_index, first_output, output_copy);
         }
 
-        // Make sure we add a gap move for spilling (if we have not done
-        // so already).
         if (!assigned) {
           range->SetSpillStartIndex(gap_index);