Fix object initialization when slack tracking for it's map is still enabled.

src/mips/macro-assembler-mips.h

Index: src/mips/macro-assembler-mips.h
diff --git a/src/mips/macro-assembler-mips.h b/src/mips/macro-assembler-mips.h
index 8890be8131cf5eb9678ca9fe14945020952ce2a8..baea8187b35996e52944f4454980aef62da3ff09 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.h
@@ -538,12 +538,8 @@ class MacroAssembler: public Assembler {
                 Label* gc_required,
                 AllocationFlags flags);
 
-  void Allocate(Register object_size,
-                Register result,
-                Register scratch1,
-                Register scratch2,
-                Label* gc_required,
-                AllocationFlags flags);
+  void Allocate(Register object_size, Register result, Register result_new,
+                Register scratch, Label* gc_required, AllocationFlags flags);
 
   void AllocateTwoByteString(Register result,
                              Register length,