[PATCH] Globals in non-zero address spaces might be null

[Pete Cooper via llvm-commits]

Hi Philip

This is an offshoot of the conversation we had here: http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20150824/295815.html <http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20150824/295815.html>

The attached patch make sure that we only add nonnull attributes to globals in address space 0.  Other address spaces may or may not permit a global to live at address 0, but we have to assume that they might.

Thanks,
Pete

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