Update clang to r339409b.
Change-Id: Ied8a188bb072c40035320acedc86164b66d920af
diff --git a/linux-x64/clang/include/llvm/XRay/FDRLogBuilder.h b/linux-x64/clang/include/llvm/XRay/FDRLogBuilder.h
new file mode 100644
index 0000000..b5e9ed5
--- /dev/null
+++ b/linux-x64/clang/include/llvm/XRay/FDRLogBuilder.h
@@ -0,0 +1,41 @@
+//===- FDRLogBuilder.h - XRay FDR Log Building Utility --------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_INCLUDE_LLVM_XRAY_FDRLOGBUILDER_H_
+#define LLVM_INCLUDE_LLVM_XRAY_FDRLOGBUILDER_H_
+
+#include "llvm/XRay/FDRRecords.h"
+
+namespace llvm {
+namespace xray {
+
+/// The LogBuilder class allows for creating ad-hoc collections of records
+/// through the `add<...>(...)` function. An example use of this API is in
+/// crafting arbitrary sequences of records:
+///
+/// auto Records = LogBuilder()
+/// .add<BufferExtents>(256)
+/// .add<NewBufferRecord>(1)
+/// .consume();
+///
+class LogBuilder {
+ std::vector<std::unique_ptr<Record>> Records;
+
+public:
+ template <class R, class... T> LogBuilder &add(T &&... A) {
+ Records.emplace_back(new R(std::forward<T>(A)...));
+ return *this;
+ }
+
+ std::vector<std::unique_ptr<Record>> consume() { return std::move(Records); }
+};
+
+} // namespace xray
+} // namespace llvm
+
+#endif // LLVM_INCLUDE_LLVM_XRAY_FDRLOGBUILDER_H_