[turbofan] Enforce stricter constraints on Throw nodes.

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 252 matching lines @@
       // Type is empty.
       CheckNotTyped(node);
       break;
     case IrOpcode::kLoop:
     case IrOpcode::kMerge:
       CHECK_EQ(control_count, input_count);
       // Type is empty.
       CheckNotTyped(node);
       break;
     case IrOpcode::kDeoptimize:
-      // Deoptimize uses are End.
-      for (auto use : node->uses()) {
-        CHECK_EQ(IrOpcode::kEnd, use->opcode());
-      }
-      // Type is empty.
-      CheckNotTyped(node);
     case IrOpcode::kReturn:
-      // Return uses are End.
+    case IrOpcode::kThrow:
+      // Deoptimize, Return and Throw uses are End.
       for (auto use : node->uses()) {
         CHECK_EQ(IrOpcode::kEnd, use->opcode());
       }
       // Type is empty.
       CheckNotTyped(node);
       break;
-    case IrOpcode::kThrow:
-      // TODO(rossberg): what are the constraints on these?
-      // Type is empty.
-      CheckNotTyped(node);
-      break;
     case IrOpcode::kTerminate:
       // Terminates take one loop and effect.
       CHECK_EQ(1, control_count);
       CHECK_EQ(1, effect_count);
       CHECK_EQ(2, input_count);
       CHECK_EQ(IrOpcode::kLoop,
                NodeProperties::GetControlInput(node)->opcode());
       // Terminate uses are End.
       for (auto use : node->uses()) {
         CHECK_EQ(IrOpcode::kEnd, use->opcode());
@@ skipping 810 matching lines @@
     // Check inputs for all nodes in the block.
     for (size_t i = 0; i < block->NodeCount(); i++) {
       Node* node = block->NodeAt(i);
       CheckInputsDominate(schedule, block, node, static_cast<int>(i) - 1);
     }
   }
 }
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8