git: openjdk/jdk: 8258853: Support separate function declaration and definition with ENABLE_IF-based SFINAE

[Kim Barrett]

Changeset: a97f3c18
Author:    Kim Barrett <kbarrett at openjdk.org>
Date:      2021-01-22 14:44:35 +0000
URL:       https://git.openjdk.java.net/jdk/commit/a97f3c18

8258853: Support separate function declaration and definition with ENABLE_IF-based SFINAE

Add ENABLE_IF_SDEFN, unit tests

Reviewed-by: jrose, eosterlund

! src/hotspot/share/metaprogramming/enableIf.hpp
! test/hotspot/gtest/metaprogramming/test_enableIf.cpp