[Allocator] MSVC apparantly has broken SFINAE context handling of 'sizeof(T)' for T == void and produces a hard error. I cannot fathom why this is OK. Oh well. switch to an explicit test for being the (potentially qualified) void type, which is the only specific case I was worried about. Hopefully this survives the libstdc++ build bots which have limited type traits implementations...
[Allocator] MSVC apparantly has broken SFINAE context handling of
'sizeof(T)' for T == void and produces a hard error. I cannot fathom why
this is OK. Oh well. switch to an explicit test for being the
(potentially qualified) void type, which is the only specific case I was
worried about. Hopefully this survives the libstdc++ build bots which
have limited type traits implementations...

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@206256 91177308-0d34-0410-b5e6-96231b3b80d8

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