[PATCH] [mips][microMIPS] Implement BREAK, EHB and EI instructions

[Zlatko Buljan]

================
Comment at: lib/Target/Mips/MicroMips32r6InstrFormats.td:229
@@ +228,3 @@
+  let Inst{25-21} = 0x00;
+  let Inst{20-16} = rt;
+  let Inst{15-6}  = funct;
----------------
dsanders wrote:
> Nit: It's called 'rs' in the docs.
I think there is some problem with docs. Tests pass with rt but drops with rs. There is also rt in format class EI_FM_MM in MicroMipsInstrFormats.td. Can you check, please.

http://reviews.llvm.org/D10090

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