[PATCH] Use ".arch_extension" ARM directive to specify the additional CPU features

[Tim Northover]

================
Comment at: include/llvm/MC/MCStreamer.h:142
@@ -141,2 +141,3 @@
   virtual void emitArch(unsigned Arch);
+  virtual void emitArchExtension(StringRef StringValue);
   virtual void emitObjectArch(unsigned Arch);
----------------
rengolin wrote:
> t.p.northover wrote:
> > I think this either needs a generic implementation, or (probably better for now) moving to ARMELFStreamer.cpp entirely. OK, so it's not called, but 
> ARMELFStreamer? But this is assembly only...
Yep, but it's essentially en ELF-dialect assembly feature so the AsmStreamer seems to live in the same file.

http://reviews.llvm.org/D7316

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