[PATCH] [mips][microMIPSr6] Implement ADDIUPC and LWPC instructions

[Zoran Jovanovic]

LGTM with a nit.


================
Comment at: test/MC/Disassembler/Mips/micromips32r6.txt:9
@@ -8,1 +8,3 @@
 
+# CHECK: addiupc $4, 100
+0x78 0x80 0x00 0x19
----------------
Nit: Please use the single-line style.

http://reviews.llvm.org/D8415

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