[turbofan] Remove case_count >= 3 limit for switch.

src/compiler/instruction-selector.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/instruction-selector.h"
 
 #include <limits>
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
@@ skipping 575 matching lines @@
       return VisitBranch(input, tbranch, fbranch);
     }
     case BasicBlock::kSwitch: {
       DCHECK_EQ(IrOpcode::kSwitch, input->opcode());
       SwitchInfo sw;
       // Last successor must be Default.
       sw.default_branch = block->successors().back();
       DCHECK_EQ(IrOpcode::kIfDefault, sw.default_branch->front()->opcode());
       // All other successors must be cases.
       sw.case_count = block->SuccessorCount() - 1;
-      DCHECK_LE(1u, sw.case_count);
       sw.case_branches = &block->successors().front();
       // Determine case values and their min/max.
       sw.case_values = zone()->NewArray<int32_t>(sw.case_count);
       sw.min_value = std::numeric_limits<int32_t>::max();
       sw.max_value = std::numeric_limits<int32_t>::min();
       for (size_t index = 0; index < sw.case_count; ++index) {
         BasicBlock* branch = sw.case_branches[index];
         int32_t value = OpParameter<int32_t>(branch->front()->op());
         sw.case_values[index] = value;
         if (sw.min_value > value) sw.min_value = value;
@@ skipping 791 matching lines @@
   return new (instruction_zone()) FrameStateDescriptor(
       instruction_zone(), state_info.type(), state_info.bailout_id(),
       state_info.state_combine(), parameters, locals, stack,
       state_info.shared_info(), outer_state);
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8