Use the simpler version of sys::fs::remove when possible.

llvm-svn: 198958
diff --git a/llvm/lib/Support/FileOutputBuffer.cpp b/llvm/lib/Support/FileOutputBuffer.cpp
index ed084fa..c01778f 100644
--- a/llvm/lib/Support/FileOutputBuffer.cpp
+++ b/llvm/lib/Support/FileOutputBuffer.cpp
@@ -28,8 +28,7 @@
 }
 
 FileOutputBuffer::~FileOutputBuffer() {
-  bool Existed;
-  sys::fs::remove(Twine(TempPath), Existed);
+  sys::fs::remove(Twine(TempPath));
 }
 
 error_code FileOutputBuffer::create(StringRef FilePath,
@@ -57,8 +56,7 @@
   }
 
   // Delete target file.
-  bool Existed;
-  EC = sys::fs::remove(FilePath, Existed);
+  EC = sys::fs::remove(FilePath);
   if (EC)
     return EC;