MIPS: Specialize FixedTypedArray<> set and get functions to solve unaligned double access.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index c6f36bf63bdb3b4d31fba9c27b42bf8efff2f583..ff21a1fed2f59cd3881f8070647e23fee18f576c 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4895,8 +4895,12 @@ class FixedTypedArray: public FixedTypedArrayBase {
   // Casting:
   static inline FixedTypedArray<Traits>* cast(Object* obj);
 
+  static inline int ElementOffset(int index) {
+    return kDataOffset + index * sizeof(ElementType);
+  }
+
   static inline int SizeFor(int length) {
-    return kDataOffset + length * sizeof(ElementType);
+    return ElementOffset(length);
   }
 
   inline ElementType get_scalar(int index);