MIPS: Avoid handle dereference during graph optimization.

src/mips/lithium-mips.h

Index: src/mips/lithium-mips.h
diff --git a/src/mips/lithium-mips.h b/src/mips/lithium-mips.h
index fb24632baf68a02c501f2b5c69d4df98ec616af7..45754aa437ad14370e5a38081261614d83be94c7 100644
--- a/src/mips/lithium-mips.h
+++ b/src/mips/lithium-mips.h
@@ -2018,6 +2018,8 @@ class LTransitionElementsKind: public LTemplateInstruction<1, 1, 2> {
 
   Handle<Map> original_map() { return hydrogen()->original_map(); }
   Handle<Map> transitioned_map() { return hydrogen()->transitioned_map(); }
+  ElementsKind from_kind() { return hydrogen()->from_kind(); }
+  ElementsKind to_kind() { return hydrogen()->to_kind(); }
 };