Input files with empty suffixes must be passed to linker.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96927 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CompilerDriver/CompilationGraph.cpp b/lib/CompilerDriver/CompilationGraph.cpp
index a36d3fb..7d1c7fe 100644
--- a/lib/CompilerDriver/CompilationGraph.cpp
+++ b/lib/CompilerDriver/CompilationGraph.cpp
@@ -34,7 +34,8 @@
 
   const std::string& LanguageMap::GetLanguage(const sys::Path& File) const {
     StringRef suf = File.getSuffix();
-    LanguageMap::const_iterator Lang = this->find(suf);
+    LanguageMap::const_iterator Lang =
+      this->find(suf.empty() ? "*empty*" : suf);
     if (Lang == this->end())
       throw std::runtime_error("File '" + File.str() +
                                 "' has unknown suffix '" + suf.str() + '\'');