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

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index 09a0e9c066fcc671526ee5dd344a2cd6016c2691..ee8aac98158ec37be3c72a17114212dcc6ef5444 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -4905,6 +4905,17 @@ void LCodeGen::DoSmiUntag(LSmiUntag* instr) {
     // If the input is a HeapObject, SmiUntag will set the carry flag.
     __ SmiUntag(result, input, SetCC);
     DeoptimizeIf(cs, instr->environment());
+  } else if (instr->hydrogen()->value()->IsLoadKeyed()) {
+    HLoadKeyed* load = HLoadKeyed::cast(instr->hydrogen()->value());
+    if (load->UsesMustHandleHole()) {
+      Label done;
+      __ SmiUntag(result, input, SetCC);
+      __ b(cc, &done);
+      __ mov(result, Operand(Smi::FromInt(0)));
+      __ bind(&done);
+    } else {
+      __ SmiUntag(result, input);
+    }
   } else {
     __ SmiUntag(result, input);
   }