[patch] Add a TargetMCStreamer interface.

[Rafael Espíndola]

This patch fixes an old FIXME by creating a TargetMCStreamer interface
and moving the target specific functions for ARM, Mips and PPC to it.

The ARM streamer is still declared in a common place because it is
used from lib/CodeGen/ARMException.cpp, but the Mips and PPC are
completely hidden in the corresponding Target directories.

Cheers,
Rafael
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