[Interpreter] Transform StrictEquality with null/undefined to special bytecodes.

src/interpreter/bytecode-peephole-optimizer.cc

Index: src/interpreter/bytecode-peephole-optimizer.cc
diff --git a/src/interpreter/bytecode-peephole-optimizer.cc b/src/interpreter/bytecode-peephole-optimizer.cc
index dfc40a2c194ec18892d52215c645ea5cda3d38da..4c22a42f30a94a1e35004ae3e4a6bc15fe310d59 100644
--- a/src/interpreter/bytecode-peephole-optimizer.cc
+++ b/src/interpreter/bytecode-peephole-optimizer.cc
@@ -138,12 +138,14 @@ void TransformLdaZeroBinaryOpToBinaryOpWithZero(Bytecode new_bytecode,
   }
 }
 
-void TransformEqualityWithNullOrUndefinedToTestUndetectable(
-    BytecodeNode* const last, BytecodeNode* const current) {
+void TransformEqualityWithNullOrUndefined(Bytecode new_bytecode,
+                                          BytecodeNode* const last,
+                                          BytecodeNode* const current) {
   DCHECK((last->bytecode() == Bytecode::kLdaNull) ||
          (last->bytecode() == Bytecode::kLdaUndefined));
-  DCHECK_EQ(current->bytecode(), Bytecode::kTestEqual);
-  current->set_bytecode(Bytecode::kTestUndetectable, current->operand(0));
+  DCHECK((current->bytecode() == Bytecode::kTestEqual) ||
+         (current->bytecode() == Bytecode::kTestEqualStrict));
+  current->set_bytecode(new_bytecode, current->operand(0));
   if (last->source_info().is_valid()) {
     current->set_source_info(last->source_info());
   }
@@ -262,13 +264,12 @@ void BytecodePeepholeOptimizer::
   }
 }
 
-void BytecodePeepholeOptimizer::
-    TransformEqualityWithNullOrUndefinedToTestUndetectableAction(
-        BytecodeNode* const node, const PeepholeActionAndData* action_data) {
+void BytecodePeepholeOptimizer::TransformEqualityWithNullOrUndefinedAction(
+    BytecodeNode* const node, const PeepholeActionAndData* action_data) {
   DCHECK(LastIsValid());
   DCHECK(!Bytecodes::IsJump(node->bytecode()));
   // Fused last and current into current.
-  TransformEqualityWithNullOrUndefinedToTestUndetectable(last(), node);
+  TransformEqualityWithNullOrUndefined(action_data->bytecode, last(), node);
   SetLast(node);
 }