[cleanup] Remove leftover tail-call check.

Bug: v8:6921
Change-Id: I3d45197dfd92b725d8caf5b6e5ebacd4b5b7b0d7
Reviewed-on: https://chromium-review.googlesource.com/718341
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Mathias Bynens <mathias@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48525}

src/compiler/js-typed-lowering.cc

@@ -1879,8 +1879,7 @@ Reduction JSTypedLowering::ReduceJSCall(Node* node) {
           node, common()->Call(Linkage::GetStubCallDescriptor(
                     isolate(), graph()->zone(), callable.descriptor(),
                     1 + arity, flags)));
-    } else if (is_builtin && Builtins::HasCppImplementation(builtin_index) &&
-               ((flags & CallDescriptor::kSupportsTailCalls) == 0)) {
+    } else if (is_builtin && Builtins::HasCppImplementation(builtin_index)) {
       // Patch {node} to a direct CEntryStub call.
       ReduceBuiltin(isolate(), jsgraph(), node, builtin_index, arity, flags);
     } else {