hg: jdk/sandbox: 8251274: Provide utilities for function SFINAE using extra template parameters

[chris.hegarty at oracle.com]

Changeset: 4549a3e87a25
Author:    kbarrett
Date:      2020-09-01 21:49 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/4549a3e87a25

8251274: Provide utilities for function SFINAE using extra template parameters
Summary: Added ENABLE_IF macro.
Reviewed-by: eosterlund, lfoltan

! src/hotspot/share/metaprogramming/enableIf.hpp