[PATCH] Don't create illegal memset with address space >= 256 in memcpyopt.

[Saleem Abdulrasool]

This seems target dependent.  Im not sure why, but, for example, SystemZ does permit it (or at the very least, continues to form the call.  Perhaps move this behind a target specific check?

For the test, can you actually run it explicitly against all the architectures we support?


http://reviews.llvm.org/D7175

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