[PATCH] [mips] [IAS] Add support for expanding LASym with a source register operand.

[Daniel Sanders]

This version LGTM with a nit


================
Comment at: lib/Target/Mips/AsmParser/MipsAsmParser.cpp:2012-2015
@@ -2009,2 +2011,6 @@
   }
+
+  if (SrcReg != Mips::NoRegister)
+    createAddu(DstReg, DstReg, SrcReg, Instructions);
+
   return false;
----------------
Nit: With this bit added we're not really loading a symbol address anymore, we're adding a symbol address and treating the $0 case as an optimization. I'd suggest hoisting this out into another function (addSymbolAddress()?) or renaming this function.

http://reviews.llvm.org/D9348

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