[PATCH] [AsmPrinter] handles addrspacecast in lowerConstant

[Jingyue Wu]

This issue turns out more difficult to fix than I expected. With the test case in my patch, LLVM runs into NVPTXAsmPrinter.h:163 <http://llvm.org/docs/doxygen/html/NVPTXAsmPrinter_8h_source.html#l00163> and prints out an `MCExpr` that represents a GEP of an addrspacecast (`i32* getelementptr (i32, i32* addrspacecast (i32 addrspace(1)* @g to i32*), i32 2)`). Even if we fix `lowerConstant` to translate `addrspacecast` into an `MCUnaryExpr`, printing an `MCExpr` is not customized yet so we are still unable to print the `MCUnaryExpr` with `generic(`.

Can we customize the printing of `MCExpr`?


http://reviews.llvm.org/D9063

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