[PATCH] Disable buffering for raw_null_ostream()

[Mehdi AMINI]

Hi rafael,

There is no need to buffer the nulls() output.
Moreover it kept a shared buffer, and made using nulls() not possible
in a multi-threaded environment.

http://reviews.llvm.org/D10861

Files:
  include/llvm/Support/raw_ostream.h

Index: include/llvm/Support/raw_ostream.h
===================================================================
--- include/llvm/Support/raw_ostream.h
+++ include/llvm/Support/raw_ostream.h
@@ -530,7 +530,7 @@
   uint64_t current_pos() const override;
 
 public:
-  explicit raw_null_ostream() {}
+  explicit raw_null_ostream() : raw_pwrite_stream(true) {}
   ~raw_null_ostream() override;
 };

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