[PATCH] [Mips] Generate warning for invalid combination of '-mnan' and '-march' options.

[Petar Jovanovic]

================
Comment at: lib/Basic/Targets.cpp:5729
@@ +5728,3 @@
+        .Case("mips5", true)
+        .Case("mips32", true)
+        .Case("mips64", true)
----------------
According to the documentation, Has2008 field in FIR Register is optional as of R3. So, if I understand this correctly, mips32r2 always uses legacy encoding. Is that correct? If so, should we add mips32r2 case as well?

http://reviews.llvm.org/D8170

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