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PR#6082: on x86-32, enforce 16-byte stack alignment for compatibility with recent GCC and Clang. Win32/MSVC keeps 4-byte stack alignment. git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.02@14943 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02