[PATCH] Implement MUL, MUH, MULU and MUHU instructions

[Daniel Sanders]

================
Comment at: lib/Target/Mips/MicroMips32r6InstrInfo.td:25
@@ +24,3 @@
+class MUL_MMR6_ENC : ARITH_FM_MMR6<"mul", 0x18>;
+class MUH_MMR6_ENC : ARITH_FM_MMR6<"muh", 0x2c>;
+class MULU_MMR6_ENC : ARITH_FM_MMR6<"mulu", 0x98>;
----------------
dsanders wrote:
> I believe this is correct, but the encoding diagram only has 9-bits specified for this 10-bit field. Presumably is a leading zero is missing. I've asked the relevant people to confirm and correct the documentation.
I've had confirmation that it's actually a trailing zero that's missing so I believe this should be 0x58

http://reviews.llvm.org/D8894

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