[turbofan] Add SimplifiedOperator::Allocate operator.

src/compiler/simplified-operator.cc

Index: src/compiler/simplified-operator.cc
diff --git a/src/compiler/simplified-operator.cc b/src/compiler/simplified-operator.cc
index 17a813e102da1d26169dbe5ddd6a52ebae1d2e04..9b34668d5c4e43466364237260116646d75ef4ff 100644
--- a/src/compiler/simplified-operator.cc
+++ b/src/compiler/simplified-operator.cc
@@ -242,6 +242,13 @@ const Operator* SimplifiedOperatorBuilder::ReferenceEqual(Type* type) {
 }
 
 
+const Operator* SimplifiedOperatorBuilder::Allocate(PretenureFlag pretenure) {
+  return new (zone())
+      Operator1<PretenureFlag>(IrOpcode::kAllocate, Operator::kNoThrow,
+                               "Allocate", 1, 1, 1, 1, 1, 0, pretenure);
+}
+
+
 const Operator* SimplifiedOperatorBuilder::LoadBuffer(BufferAccess access) {
   switch (access.external_array_type()) {
 #define LOAD_BUFFER(Type, type, TYPE, ctype, size) \