Refactor and improve inlined double-aligned allocations

src/macro-assembler.h

Index: src/macro-assembler.h
diff --git a/src/macro-assembler.h b/src/macro-assembler.h
index 11e2217e07c218a098d0313b8be5c6b5ff39c00d..9e7112369e570c1a87d43b52428de117c89c2c52 100644
--- a/src/macro-assembler.h
+++ b/src/macro-assembler.h
@@ -36,6 +36,23 @@ enum InvokeFlag {
 };
 
 
+// Flags used for the AllocateInNewSpace functions.
+enum AllocationFlags {
+  // No special flags.
+  NO_ALLOCATION_FLAGS = 0,
+  // Return the pointer to the allocated already tagged as a heap object.
+  TAG_OBJECT = 1 << 0,
+  // The content of the result register already contains the allocation top in
+  // new space.
+  RESULT_CONTAINS_TOP = 1 << 1,
+  // Specify that the requested size of the space to allocate is specified in
+  // words instead of bytes.
+  SIZE_IN_WORDS = 1 << 2,
+  // Align the allocation to a multiple of kDoubleSize
+  DOUBLE_ALIGNMENT = 1 << 3
+};
+
+
 // Invalid depth in prototype chain.
 const int kInvalidProtoDepth = -1;