Base isPodLike on is_trivially_copyable for GCC 5 and MSVC
Base isPodLike on is_trivially_copyable for GCC 5 and MSVC

It would be nice to get rid of the version checks here, but that will
have to wait until libstdc++ is upgraded to 5.0 everywhere ...

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@230021 91177308-0d34-0410-b5e6-96231b3b80d8

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