[Mips] Do not check for options from the OPT_mips_CPUs_Group. All these
options are aliases now.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@192290 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index 378c3b6..4e68a87 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -2181,16 +2181,9 @@
     return false;
 
   Arg *A = Args.getLastArg(options::OPT_march_EQ,
-                           options::OPT_mcpu_EQ,
-                           options::OPT_mips_CPUs_Group);
+                           options::OPT_mcpu_EQ);
 
-  if (!A)
-    return false;
-
-  if (A->getOption().matches(options::OPT_mips_CPUs_Group))
-    return A->getOption().matches(options::OPT_mips32r2);
-
-  return A->getValue() == StringRef("mips32r2");
+  return A && A->getValue() == StringRef("mips32r2");
 }
 
 static StringRef getMultilibDir(const llvm::Triple &Triple,