Use the simpler is_directory.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@186487 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/CompilerInstance.cpp b/lib/Frontend/CompilerInstance.cpp
index 44d9ec2..f06eaf8 100644
--- a/lib/Frontend/CompilerInstance.cpp
+++ b/lib/Frontend/CompilerInstance.cpp
@@ -1052,8 +1052,7 @@
          Dir(ModuleCachePathNative.str(), EC), DirEnd;
        Dir != DirEnd && !EC; Dir.increment(EC)) {
     // If we don't have a directory, there's nothing to look into.
-    bool IsDirectory;
-    if (llvm::sys::fs::is_directory(Dir->path(), IsDirectory) || !IsDirectory)
+    if (!llvm::sys::fs::is_directory(Dir->path()))
       continue;
 
     // Walk all of the files within this directory.