MIPS: Properly initialize element-transitioning array literals on ARM.

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 6ae8657e1e6399114a0ebddbb62f2421d7ed8dcd..ef015fda53cc7270f1c505f61ae7d550c2fe4394 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.h
@@ -934,7 +934,8 @@ class MacroAssembler: public Assembler {
 
   // Check to see if maybe_number can be stored as a double in
   // FastDoubleElements. If it can, store it at the index specified by key in
-  // the FastDoubleElements array elements, otherwise jump to fail.
+  // the FastDoubleElements array elements. Otherwise jump to fail, in which
+  // case scratch2, scratch3 and scratch4 are unmodified.
   void StoreNumberToDoubleElements(Register value_reg,
                                    Register key_reg,
                                    Register receiver_reg,