[stubs] Introduce a proper ToBooleanStub.

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index 64d435ff9ca9cfb96c4bab0d1b79f1ad15f75927..59f67cb05e44225382a081c167b960c946b488a0 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -139,8 +139,7 @@ void JSGenericLowering::LowerJSTypeOf(Node* node) {
 void JSGenericLowering::LowerJSToBoolean(Node* node) {
   CallDescriptor::Flags flags = AdjustFrameStatesForCall(node);
   Callable callable = CodeFactory::ToBoolean(isolate());
-  ReplaceWithStubCall(node, callable,
-                      CallDescriptor::kPatchableCallSite | flags);
+  ReplaceWithStubCall(node, callable, flags);
 }