Add -x option (like in gcc).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50750 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvmc2/llvmc.cpp b/tools/llvmc2/llvmc.cpp
index b4f0afe..138c306 100644
--- a/tools/llvmc2/llvmc.cpp
+++ b/tools/llvmc2/llvmc.cpp
@@ -35,6 +35,9 @@
                                      cl::ZeroOrMore);
 cl::opt<std::string> OutputFilename("o", cl::desc("Output file name"),
                                     cl::value_desc("file"));
+cl::list<std::string> Languages("x",
+          cl::desc("Specify the language of the following input files"),
+          cl::ZeroOrMore);
 cl::opt<bool> VerboseMode("v",
                           cl::desc("Enable verbose mode"));
 cl::opt<bool> WriteGraph("write-graph",