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

src/compiler/verifier.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/verifier.h"
 
 #include <algorithm>
 #include <deque>
 #include <queue>
 #include <sstream>
@@ skipping 232 matching lines @@
               }
             }
             ++count_case;
             break;
           }
           case IrOpcode::kIfDefault: {
             ++count_default;
             break;
           }
           default: {
-            UNREACHABLE();
+            V8_Fatal(__FILE__, __LINE__, "Switch #%d illegally used by #%d:%s",
+                     node->id(), use->id(), use->op()->mnemonic());
             break;
           }
         }
       }
-      CHECK_LE(1, count_case);
       CHECK_EQ(1, count_default);
       CHECK_EQ(node->op()->ControlOutputCount(), count_case + count_default);
       // Type is empty.
       CheckNotTyped(node);
       break;
     }
     case IrOpcode::kIfValue:
     case IrOpcode::kIfDefault:
       CHECK_EQ(IrOpcode::kSwitch,
                NodeProperties::GetControlInput(node)->opcode());
@@ skipping 965 matching lines @@
          replacement->op()->EffectOutputCount() > 0);
   DCHECK(!NodeProperties::IsFrameStateEdge(edge) ||
          replacement->opcode() == IrOpcode::kFrameState);
 }
 
 #endif  // DEBUG
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8