[interpreter] Remove BytecodeArrayBuilder::Illegal().

src/compiler/bytecode-graph-builder.cc

 // Copyright 2015 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/bytecode-graph-builder.h"
 
 #include "src/compiler/bytecode-branch-analysis.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/operator-properties.h"
 #include "src/interpreter/bytecodes.h"
@@ skipping 1401 matching lines @@
   // Consumed by the BytecodeArrayIterator.
   UNREACHABLE();
 }
 
 void BytecodeGraphBuilder::VisitExtraWide() {
   // Consumed by the BytecodeArrayIterator.
   UNREACHABLE();
 }
 
 void BytecodeGraphBuilder::VisitIllegal() {
-  NewNode(javascript()->CallRuntime(Runtime::kAbort),
-      jsgraph()->Constant(kIllegalBytecode));
+  // Not emitted in valid bytecode.
+  UNREACHABLE();
 }
 
 void BytecodeGraphBuilder::VisitNop() {}
 
 void BytecodeGraphBuilder::SwitchToMergeEnvironment(int current_offset) {
   if (merge_environments_[current_offset] != nullptr) {
     if (environment() != nullptr) {
       merge_environments_[current_offset]->Merge(environment());
     }
     set_environment(merge_environments_[current_offset]);
@@ skipping 256 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8