Change default target architecture from Mips1 to Mips32r1 in preparation for
removing support for Mips1 and Mips2. 

This change and the ones that follow have been discussed with and approved by
Bruno.

llvm-svn: 139344
diff --git a/llvm/lib/Target/Mips/MipsSubtarget.cpp b/llvm/lib/Target/Mips/MipsSubtarget.cpp
index c273d0a..dd115fd 100644
--- a/llvm/lib/Target/Mips/MipsSubtarget.cpp
+++ b/llvm/lib/Target/Mips/MipsSubtarget.cpp
@@ -31,8 +31,7 @@
 {
   std::string CPUName = CPU;
   if (CPUName.empty())
-    CPUName = "mips1";
-  MipsArchVersion = Mips1;
+    CPUName = "mips32r1";
 
   // Parse features string.
   ParseSubtargetFeatures(CPUName, FS);