[Mips] Change default CPU for MIPS 32/64 targets. Now they are mips32r2/mips64r2 respectively.

llvm-svn: 200222
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 3e9ebf8..3176f1f 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -838,8 +838,8 @@
                              const llvm::Triple &Triple,
                              StringRef &CPUName,
                              StringRef &ABIName) {
-  const char *DefMips32CPU = "mips32";
-  const char *DefMips64CPU = "mips64";
+  const char *DefMips32CPU = "mips32r2";
+  const char *DefMips64CPU = "mips64r2";
 
   if (Arg *A = Args.getLastArg(options::OPT_march_EQ,
                                options::OPT_mcpu_EQ))