MIPS: Handle holes in smi-untag from LoadKeyed requiring hole handling.

src/mips/lithium-mips.cc

Index: src/mips/lithium-mips.cc
diff --git a/src/mips/lithium-mips.cc b/src/mips/lithium-mips.cc
index 5ca8cd9b96c69fef24d28a699391eb7c267061d5..04125d1696d11eb40138281f9d81d3336701c572 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -1773,6 +1773,13 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
       if (instr->value()->type().IsSmi()) {
         value = UseRegisterAtStart(instr->value());
         res = DefineAsRegister(new(zone()) LSmiUntag(value, false));
+        if (instr->value()->IsLoadKeyed()) {
+          HLoadKeyed* load_keyed = HLoadKeyed::cast(instr->value());
+          if (load_keyed->UsesMustHandleHole() &&
+              load_keyed->hole_mode() == NEVER_RETURN_HOLE) {
+            res = AssignEnvironment(res);
+          }
+        }
       } else {
         value = UseRegister(instr->value());
         LOperand* temp1 = TempRegister();