[PATCH] [AsmPrinter] handles addrspacecast in lowerConstant

[Justin Holewinski]

Handling this aspect of PTX has always been a PITA.  Internally, we customize lowerConstant to handle this case and create an MCExpr subclass (`NVPTXGenericMCSymbolRefExpr`) that handles the printing of "`generic(<symbolref>)`".  Something like this will be needed upstream.  Our internal version is a bit of a hack, so I'll want to come up with something cleaner for upstream.  If you don't have time to tackle that, I'll try to put something together soon.


http://reviews.llvm.org/D9063

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