Alias std::launder on MSVC

Summary: [Folly] Alias `std::launder` on `MSVC` to avoid ambiguity. Fixes #802. Reviewed By: Orvid Differential Revision: D7286052 fbshipit-source-id: 7cd89c9ad236a433f53fbdb9e2e024b85105827e

Alias std::launder on MSVC
Summary: [Folly] Alias `std::launder` on `MSVC` to avoid ambiguity. Fixes #802. Reviewed By: Orvid Differential Revision: D7286052 fbshipit-source-id: 7cd89c9ad236a433f53fbdb9e2e024b85105827e
79778122 · Yedidya Feldblum · Facebook Github Bot · d4ec31ab · 79778122
Commit 79778122 authored Mar 15, 2018 by Yedidya Feldblum Committed by Facebook Github Bot Mar 15, 2018
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folly/lang/Launder.h folly/lang/Launder.h +1 -1

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--- a/folly/lang/Launder.h
+++ b/folly/lang/Launder.h
@@ -26,7 +26,7 @@
 *  * std::launder
 */
-#if __cpp_lib_launder >= 201606
+#if __cpp_lib_launder >= 201606 || _MSC_FULL_VER >= 191426310
 namespace folly {