[PATCH] [mips][microMIPSr6] Implement SUB and SUBU instructions

[Daniel Sanders]

LGTM with a formatting nit


================
Comment at: test/MC/Disassembler/Mips/micromips32r6.txt:18-22
@@ +17,6 @@
+
+# CHECK: sub $3, $4, $5
+0x00 0xa4 0x19 0x90
+
+# CHECK: subu $3, $4, $5
+0x00 0xa4 0x19 0xd0
----------------
Nit: As per D8704, could you use one-per-line formatting?

http://reviews.llvm.org/D8764

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