[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 b732f8b96fae8197abf145ffc3abe0af50df6e09..1e7520b2ef2a25e964caadded4e3f9bc8d6e33de 100644
--- a/src/interpreter/bytecode-array-builder.cc
+++ b/src/interpreter/bytecode-array-builder.cc
@@ -633,6 +633,16 @@ BytecodeArrayBuilder& BytecodeArrayBuilder::CallRuntime(
 }
 
 
+BytecodeArrayBuilder& BytecodeArrayBuilder::Delete(Register object,
+                                                   LanguageMode language_mode) {
+  Bytecode bytecode = (language_mode == STRICT)

[rmcilroy, 2015/10/21 14:52:54]

Could you move this code into a BytecodeForDelete function similar to
BytecodeForStoreGlobal, with a switch on language_mode and an explicitly
UNIMPLEMENTED for STRONG and UNREACHABLE for default.

[mythria, 2015/10/23 14:48:00]

Done.

+                          ? Bytecode::kDeletePropertyStrict
+                          : Bytecode::kDeletePropertySloppy;
+  Output(bytecode, 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.