[llvm-commits] [patch][pr8927] Don't merge two constants if both addresses are significant

[Rafael Ávila de Espíndola]

This patch fixes the original testcase in PR8927. It also causes a clang 
binary built with a patched clang to increase in size by 0.21%.

We can probably get some of the size back by writing a pass that detects 
that a global never has its pointer compared and adds unnamed_addr to 
it. It is also possible that there are some other cases clang could add 
unnamed_addr to.

Is the patch OK?

Cheers,
Rafael
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