[turbofan] Adds an Allocate macro to the CodeStubAssembler.

src/compiler/code-stub-assembler.h

Index: src/compiler/code-stub-assembler.h
diff --git a/src/compiler/code-stub-assembler.h b/src/compiler/code-stub-assembler.h
index a12414b3d9f42e82f7100962e87b940b3dc6ed34..85418a9150a6eaba51a7cec35752e6327a1e24f4 100644
--- a/src/compiler/code-stub-assembler.h
+++ b/src/compiler/code-stub-assembler.h
@@ -111,6 +111,14 @@ class CodeStubAssembler {
     Impl* impl_;
   };
 
+  enum AllocationFlag : uint8_t {
+    kNone = 0,
+    kDoubleAlignment = 1,
+    kPretenured = 1 << 1
+  };
+
+  typedef base::Flags<AllocationFlag> AllocationFlags;
+
   // ===========================================================================
   // Base Assembler
   // ===========================================================================
@@ -241,6 +249,9 @@ class CodeStubAssembler {
                                       int additional_offset = 0);
   Node* LoadFixedArrayElementConstantIndex(Node* object, int index);
 
+  // Allocate an object of the given size.
+  Node* Allocate(int size, AllocationFlags flags);
+
   // Store an array element to a FixedArray.
   Node* StoreFixedArrayElementNoWriteBarrier(Node* object, Node* index,
                                              Node* value);
@@ -272,6 +283,11 @@ class CodeStubAssembler {
 
   Node* SmiShiftBitsConstant();
 
+  Node* AllocateRawAligned(Node* size_in_bytes, AllocationFlags flags,
+                           Node* top_address, Node* limit_address);
+  Node* AllocateRawUnaligned(Node* size_in_bytes, AllocationFlags flags,
+                             Node* top_adddress, Node* limit_address);
+
   base::SmartPointer<RawMachineAssembler> raw_assembler_;
   Code::Flags flags_;
   const char* name_;
@@ -281,6 +297,8 @@ class CodeStubAssembler {
   DISALLOW_COPY_AND_ASSIGN(CodeStubAssembler);
 };
 
+DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
+
 class CodeStubAssembler::Label {
  public:
   explicit Label(CodeStubAssembler* assembler);