[PATCH] [mips] [IAS] Refactor the function which checks for the availability of AT. NFC.

[Daniel Sanders]

LGTM


================
Comment at: lib/Target/Mips/AsmParser/MipsAsmParser.cpp:2388
@@ +2387,3 @@
+unsigned MipsAsmParser::getATReg(SMLoc Loc) {
+  unsigned ATIndex = AssemblerOptions.back()->getATRegNum();
+  if (ATIndex == 0) {
----------------
We should correct this getATRegNum() function too since it really returns an index. That can be a follow-on patch if you prefer.

http://reviews.llvm.org/D8478

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