Refactor frontend InputKind to prepare for treating module maps as a distinct kind of input.

No functionality change intended.

llvm-svn: 301442
diff --git a/clang/lib/CodeGen/CodeGenAction.cpp b/clang/lib/CodeGen/CodeGenAction.cpp
index b864069..f57cbe8 100644
--- a/clang/lib/CodeGen/CodeGenAction.cpp
+++ b/clang/lib/CodeGen/CodeGenAction.cpp
@@ -944,7 +944,7 @@
 
 void CodeGenAction::ExecuteAction() {
   // If this is an IR file, we have to treat it specially.
-  if (getCurrentFileKind() == IK_LLVM_IR) {
+  if (getCurrentFileKind().getLanguage() == InputKind::LLVM_IR) {
     BackendAction BA = static_cast<BackendAction>(Act);
     CompilerInstance &CI = getCompilerInstance();
     std::unique_ptr<raw_pwrite_stream> OS =