Remove obsolete code for finding a fallback iOS SDK.  <rdar://problem/11378535>

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@156149 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 7565c90..7a9d1cf 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -4033,9 +4033,6 @@
   } else if (const Arg *A = Args.getLastArg(options::OPT_isysroot)) {
     CmdArgs.push_back("-syslibroot");
     CmdArgs.push_back(A->getValue(Args));
-  } else if (getDarwinToolChain().isTargetIPhoneOS()) {
-    CmdArgs.push_back("-syslibroot");
-    CmdArgs.push_back("/Developer/SDKs/Extra");
   }
 
   Args.AddLastArg(CmdArgs, options::OPT_twolevel__namespace);