Driver: implement driver automagic support for -lcc_kext

Rewrite linker arguments to use libclang_rt.cc_kext.a
instead of gcc-specific libcc_kext.a

Resolves Radar 7808495


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@114193 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 028db8c..58f5565 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -116,6 +116,8 @@
     // Handle reserved library options.
     if (A.getOption().matches(options::OPT_Z_reserved_lib_stdcxx)) {
       TC.AddCXXStdlibLibArgs(Args, CmdArgs);
+    } else if (A.getOption().matches(options::OPT_Z_reserved_lib_cckext)) {
+      TC.AddCCKextLibArgs(Args, CmdArgs);
     } else
       A.renderAsInput(Args, CmdArgs);
   }