[llvm-commits] Proof of concept patch for unifying the .s/ELF emission of .ARM.attributes

[Jason Kim]

Instead of adding a  ARM subclass for MCELFStreamer,  I instead use
ARMAsmPrinter class.
Plan is to flush out emitELFAttributes() to emit the blobs in the
.ARM.attributes section.
That way, the arch specific cruft is remains in the arch-specific class.

(existing test covers this patch),

Feedback greatly appreciated.
Diffview:  http://codereview.chromium.org/3598009

Thanks for reading!

-Jason
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