Optimize various forms of slice.call(arguments, ...)

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index cd61ab52b92a657d66eaef1d2b759e3123584d0d..d8afb164f556463a818490ece38ec09a588b447b 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -5344,6 +5344,23 @@ BOOL_GETTER(SharedFunctionInfo,
             compiler_hints,
             optimization_disabled,
             kOptimizationDisabled)
+BOOL_GETTER(SharedFunctionInfo,
+            compiler_hints,
+            optimistic_optimizations,
+            kOptimisticOptimizations)
+
+
+bool SharedFunctionInfo::use_optimistic_optimizations() {
+  return BooleanBit::get(compiler_hints(), kOptimisticOptimizations)
+      ? false : true;
+}
+
+
+void SharedFunctionInfo::disable_optimistic_optimizations() {
+  set_compiler_hints(BooleanBit::set(compiler_hints(),
+                                     kOptimisticOptimizations,
+                                     true));
+}
 
 
 void SharedFunctionInfo::set_optimization_disabled(bool disable) {