MIPS: Fix assert on ARM

Port r14781 (a3491cb7)

BUG=

Review URL: https://codereview.chromium.org/15952002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14788 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/lithium-mips.cc

@@ -2076,7 +2076,7 @@ LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
     if (instr->representation().IsDouble()) {
       obj = UseTempRegister(instr->elements());
     } else {
-      ASSERT(instr->representation().IsTagged());
+      ASSERT(instr->representation().IsSmiOrTagged());
       obj = UseRegisterAtStart(instr->elements());
     }
     result = new(zone()) LLoadKeyed(obj, key);