Set register class of a register according to value of HasMips64.

llvm-svn: 140570
diff --git a/llvm/lib/Target/Mips/MipsISelLowering.cpp b/llvm/lib/Target/Mips/MipsISelLowering.cpp
index 6ad7724..4578d22 100644
--- a/llvm/lib/Target/Mips/MipsISelLowering.cpp
+++ b/llvm/lib/Target/Mips/MipsISelLowering.cpp
@@ -2268,7 +2268,7 @@
       else if (RegVT == MVT::f32)
         RC = Mips::FGR32RegisterClass;
       else if (RegVT == MVT::f64)
-        RC = Mips::AFGR64RegisterClass;
+        RC = HasMips64 ? Mips::FGR64RegisterClass : Mips::AFGR64RegisterClass;
       else
         llvm_unreachable("RegVT not supported by FormalArguments Lowering");