[Interpreter] Adds delete operator to interpreter.

src/interpreter/bytecode-array-builder.cc

Index: src/interpreter/bytecode-array-builder.cc
diff --git a/src/interpreter/bytecode-array-builder.cc b/src/interpreter/bytecode-array-builder.cc
index 26b5414b3a6b79305c066696a13cc0ef1a6622c9..a4124a8a33277794751ed39161532d189bf54dc9 100644
--- a/src/interpreter/bytecode-array-builder.cc
+++ b/src/interpreter/bytecode-array-builder.cc
@@ -696,6 +696,13 @@ BytecodeArrayBuilder& BytecodeArrayBuilder::CallRuntime(
 }
 
 
+BytecodeArrayBuilder& BytecodeArrayBuilder::Delete(Register object,
+                                                   LanguageMode language_mode) {
+  Output(BytecodeForDelete(language_mode), object.ToOperand());
+  return *this;
+}
+
+
 size_t BytecodeArrayBuilder::GetConstantPoolEntry(Handle<Object> object) {
   // These constants shouldn't be added to the constant pool, the should use
   // specialzed bytecodes instead.
@@ -1016,6 +1023,23 @@ Bytecode BytecodeArrayBuilder::BytecodeForCreateArguments(
 
 
 // static
+Bytecode BytecodeArrayBuilder::BytecodeForDelete(
+    LanguageMode language_mode) {
+  switch (language_mode) {
+    case SLOPPY:
+      return Bytecode::kDeletePropertySloppy;
+    case STRICT:
+      return Bytecode::kDeletePropertyStrict;
+    case STRONG:
+      UNIMPLEMENTED();
+    default:
+      UNREACHABLE();
+  }
+  return static_cast<Bytecode>(-1);
+}
+
+
+// static
 bool BytecodeArrayBuilder::FitsInIdx8Operand(int value) {
   return kMinUInt8 <= value && value <= kMaxUInt8;
 }