[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 887f9ce9737525c9e12231d4f1dcfac796cb7016..acfe484ad37f85c6a32ff881d281ab3642c5f5ca 100644
--- a/src/interpreter/bytecode-peephole-optimizer.cc
+++ b/src/interpreter/bytecode-peephole-optimizer.cc
@@ -141,13 +141,14 @@ BytecodeNode TransformLdaZeroBinaryOpToBinaryOpWithZero(
   return node;
 }
 
-BytecodeNode TransformEqualityWithNullOrUndefinedToTestUndetectable(
-    BytecodeNode* const last, BytecodeNode* const current) {
+BytecodeNode 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);
-  BytecodeNode node(BytecodeNode::TestUndetectable(current->source_info(),
-                                                   current->operand(0)));
+  DCHECK((current->bytecode() == Bytecode::kTestEqual) ||
+         (current->bytecode() == Bytecode::kTestEqualStrict));
+  BytecodeNode node(new_bytecode, current->operand(0), current->source_info());
   if (last->source_info().is_valid()) {
     node.set_source_info(last->source_info());
   }
@@ -267,14 +268,13 @@ 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.
-  BytecodeNode new_node(
-      TransformEqualityWithNullOrUndefinedToTestUndetectable(last(), node));
+  BytecodeNode new_node(TransformEqualityWithNullOrUndefined(
+      action_data->bytecode, last(), node));
   SetLast(&new_node);
 }