[PATCH] R600/SI: Use ELF64 format instead of ELF32

[Rafael Ávila de Espíndola]

LGTM


================
Comment at: lib/Target/R600/MCTargetDesc/AMDGPUAsmBackend.cpp:130
@@ -129,1 +129,3 @@
 class ELFAMDGPUAsmBackend : public AMDGPUAsmBackend {
+private:
+  bool Is64Bit;
----------------
You don't need this private:

http://reviews.llvm.org/D10392

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