Driver, Frontend: add CUDA language support

llvm-svn: 120544
diff --git a/clang/lib/Frontend/FrontendOptions.cpp b/clang/lib/Frontend/FrontendOptions.cpp
index 9dfee24..0a20051 100644
--- a/clang/lib/Frontend/FrontendOptions.cpp
+++ b/clang/lib/Frontend/FrontendOptions.cpp
@@ -26,6 +26,7 @@
     .Cases("C", "cc", "cp", IK_CXX)
     .Cases("cpp", "CPP", "c++", "cxx", "hpp", IK_CXX)
     .Case("cl", IK_OpenCL)
+    .Case("cu", IK_CUDA)
     .Cases("ll", "bc", IK_LLVM_IR)
     .Default(IK_C);
 }