Check that index and length are Smi in bounds check.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 531fbffa7912c99a1f9351cd0963402b49f07e3d..161a82c243670b26e6865f6a15c513bbe8b55ee0 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -3739,7 +3739,27 @@ void LCodeGen::DoStoreNamedGeneric(LStoreNamedGeneric* instr) {
 }
 
 
+void LCodeGen::DeoptIfTaggedButNotSmi(LEnvironment* environment,
+                                      HValue* value,
+                                      LOperand* operand) {
+  if (value->representation().IsTagged() && !value->type().IsSmi()) {
+    if (operand->IsRegister()) {
+      __ test(ToRegister(operand), Immediate(kSmiTagMask));
+    } else {
+      __ test(ToOperand(operand), Immediate(kSmiTagMask));
+    }
+    DeoptimizeIf(not_zero, environment);
+  }
+}
+
+
 void LCodeGen::DoBoundsCheck(LBoundsCheck* instr) {
+  DeoptIfTaggedButNotSmi(instr->environment(),
+                         instr->hydrogen()->length(),
+                         instr->length());
+  DeoptIfTaggedButNotSmi(instr->environment(),
+                         instr->hydrogen()->index(),
+                         instr->index());
   if (instr->index()->IsConstantOperand()) {
     int constant_index =
         ToInteger32(LConstantOperand::cast(instr->index()));