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

src/compiler/verifier.cc

Index: src/compiler/verifier.cc
diff --git a/src/compiler/verifier.cc b/src/compiler/verifier.cc
index 5e1eae685694f7a621ba3a4b13c96570649298d3..db344e42a08cfe6149f381a7881a83e79c263ba8 100644
--- a/src/compiler/verifier.cc
+++ b/src/compiler/verifier.cc
@@ -250,12 +250,12 @@ void Verifier::Visitor::Check(Node* node) {
             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.