[llvm-commits] [patch][8927] Add an unnamed_addr attribute

[Rafael Ávila de Espíndola]

This is the first step in fixing PR8927:

The attached patch adds a unnamed_addr bit to global constants and 
functions. This will be used to indicate that the address is not 
significant and therefore the constant or function can be merged with 
others.

If an optimization pass can show that an address is not used, it can set 
this.

Examples of things that can have this set by the FE are globals created 
to hold string literals and C++ constructors.

Aliases and non constant globals are not allowed to have unnamed_addr 
since I couldn't figure out any use for it.

Comments?

Cheers,
Rafael
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