[Builtins] Smi-check the spread and go to runtime in CheckSpreadAndPushToStack.

src/builtins/mips64/builtins-mips64.cc

Index: src/builtins/mips64/builtins-mips64.cc
diff --git a/src/builtins/mips64/builtins-mips64.cc b/src/builtins/mips64/builtins-mips64.cc
index 66e95e587be020c8bf07640917078cb2f149428f..cb469c5b4e8e2e2c1e5b0d0d2c68314cacb25c84 100644
--- a/src/builtins/mips64/builtins-mips64.cc
+++ b/src/builtins/mips64/builtins-mips64.cc
@@ -2669,11 +2669,12 @@ static void CheckSpreadAndPushToStack(MacroAssembler* masm) {
 
   Register native_context = a5;
 
+  Label runtime_call, push_args;
   __ ld(spread, MemOperand(sp, 0));
+  __ JumpIfSmi(spread, &runtime_call);
   __ ld(spread_map, FieldMemOperand(spread, HeapObject::kMapOffset));
   __ ld(native_context, NativeContextMemOperand());
 
-  Label runtime_call, push_args;
   // Check that the spread is an array.
   __ lbu(scratch, FieldMemOperand(spread_map, Map::kInstanceTypeOffset));
   __ Branch(&runtime_call, ne, scratch, Operand(JS_ARRAY_TYPE));