MIPS: Require smi for keyed store to smi.

Port r14779 (33d24080)

BUG=

Review URL: https://codereview.chromium.org/15889007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14787 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/lithium-mips.cc

@@ -2126,7 +2126,7 @@ LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
       key = UseRegisterOrConstantAtStart(instr->key());
       val = UseTempRegister(instr->value());
     } else {
-      ASSERT(instr->value()->representation().IsTagged());
+      ASSERT(instr->value()->representation().IsSmiOrTagged());
       object = UseTempRegister(instr->elements());
       val = needs_write_barrier ? UseTempRegister(instr->value())
           : UseRegisterAtStart(instr->value());