Add allocation support to ia32 macro assembler

src/ia32/codegen-ia32.cc

Index: src/ia32/codegen-ia32.cc
===================================================================
--- src/ia32/codegen-ia32.cc	(revision 2770)
+++ src/ia32/codegen-ia32.cc	(working copy)
@@ -6948,21 +6948,18 @@
                                              Register scratch1,
                                              Register scratch2,
                                              Register result) {
-  ExternalReference allocation_top =
-      ExternalReference::new_space_allocation_top_address();
-  ExternalReference allocation_limit =
-      ExternalReference::new_space_allocation_limit_address();
-  __ mov(Operand(scratch1), Immediate(allocation_top));
-  __ mov(result, Operand(scratch1, 0));
-  __ lea(scratch2, Operand(result, HeapNumber::kSize));  // scratch2: new top
-  __ cmp(scratch2, Operand::StaticVariable(allocation_limit));
-  __ j(above, need_gc, not_taken);
+  // Allocate heap number in new space.
+  __ AllocateObjectInNewSpace(HeapNumber::kSize,
+                              result,
+                              scratch1,
+                              scratch2,
+                              need_gc,
+                              false);
 
-  __ mov(Operand(scratch1, 0), scratch2);  // store new top
+  // Set the map and tag the result.
   __ mov(Operand(result, HeapObject::kMapOffset),
          Immediate(Factory::heap_number_map()));
-  // Tag old top and use as result.
-  __ add(Operand(result), Immediate(kHeapObjectTag));
+  __ or_(Operand(result), Immediate(kHeapObjectTag));
 }