[turbofan] Rip out the unused OsrGuard node.

src/compiler/js-frame-specialization.cc

Index: src/compiler/js-frame-specialization.cc
diff --git a/src/compiler/js-frame-specialization.cc b/src/compiler/js-frame-specialization.cc
index 73e1b7dd24c94de3144895b095051f6d355303eb..d4f6822de61d47995abfa7cc3e12d227e739745d 100644
--- a/src/compiler/js-frame-specialization.cc
+++ b/src/compiler/js-frame-specialization.cc
@@ -16,8 +16,6 @@ Reduction JSFrameSpecialization::Reduce(Node* node) {
   switch (node->opcode()) {
     case IrOpcode::kOsrValue:
       return ReduceOsrValue(node);
-    case IrOpcode::kOsrGuard:
-      return ReduceOsrGuard(node);
     case IrOpcode::kParameter:
       return ReduceParameter(node);
     default:
@@ -47,13 +45,6 @@ Reduction JSFrameSpecialization::ReduceOsrValue(Node* node) {
   return Replace(jsgraph()->Constant(value));
 }
 
-Reduction JSFrameSpecialization::ReduceOsrGuard(Node* node) {
-  DCHECK_EQ(IrOpcode::kOsrGuard, node->opcode());
-  ReplaceWithValue(node, node->InputAt(0),
-                   NodeProperties::GetEffectInput(node));
-  return Changed(node);
-}
-
 Reduction JSFrameSpecialization::ReduceParameter(Node* node) {
   DCHECK_EQ(IrOpcode::kParameter, node->opcode());
   Handle<Object> value;