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On Windows 7 32-bit, the alignment characteristic of the TLS Directory don't appear to be respected by the PE Loader, leading to crashes. As a result, let's disable has_thread_local to make sure TLS goes through the emulation layer.
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.