Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/CodeGen/LazyMachineBlockFrequencyInfo.h b/linux-x64/clang/include/llvm/CodeGen/LazyMachineBlockFrequencyInfo.h
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+///===- LazyMachineBlockFrequencyInfo.h - Lazy Block Frequency -*- C++ -*--===//
+///
+/// The LLVM Compiler Infrastructure
+///
+/// This file is distributed under the University of Illinois Open Source
+/// License. See LICENSE.TXT for details.
+///
+///===---------------------------------------------------------------------===//
+/// \file
+/// This is an alternative analysis pass to MachineBlockFrequencyInfo. The
+/// difference is that with this pass the block frequencies are not computed
+/// when the analysis pass is executed but rather when the BFI result is
+/// explicitly requested by the analysis client.
+///
+///===---------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_LAZYMACHINEBLOCKFREQUENCYINFO_H
+#define LLVM_ANALYSIS_LAZYMACHINEBLOCKFREQUENCYINFO_H
+
+#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
+#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
+#include "llvm/CodeGen/MachineDominators.h"
+#include "llvm/CodeGen/MachineLoopInfo.h"
+
+namespace llvm {
+/// \brief This is an alternative analysis pass to MachineBlockFrequencyInfo.
+/// The difference is that with this pass, the block frequencies are not
+/// computed when the analysis pass is executed but rather when the BFI result
+/// is explicitly requested by the analysis client.
+///
+/// This works by checking querying if MBFI is available and otherwise
+/// generating MBFI on the fly. In this case the passes required for (LI, DT)
+/// are also queried before being computed on the fly.
+///
+/// Note that it is expected that we wouldn't need this functionality for the
+/// new PM since with the new PM, analyses are executed on demand.
+
+class LazyMachineBlockFrequencyInfoPass : public MachineFunctionPass {
+private:
+ /// If generated on the fly this own the instance.
+ mutable std::unique_ptr<MachineBlockFrequencyInfo> OwnedMBFI;
+
+ /// If generated on the fly this own the instance.
+ mutable std::unique_ptr<MachineLoopInfo> OwnedMLI;
+
+ /// If generated on the fly this own the instance.
+ mutable std::unique_ptr<MachineDominatorTree> OwnedMDT;
+
+ /// The function.
+ MachineFunction *MF = nullptr;
+
+ /// \brief Calculate MBFI and all other analyses that's not available and
+ /// required by BFI.
+ MachineBlockFrequencyInfo &calculateIfNotAvailable() const;
+
+public:
+ static char ID;
+
+ LazyMachineBlockFrequencyInfoPass();
+
+ /// \brief Compute and return the block frequencies.
+ MachineBlockFrequencyInfo &getBFI() { return calculateIfNotAvailable(); }
+
+ /// \brief Compute and return the block frequencies.
+ const MachineBlockFrequencyInfo &getBFI() const {
+ return calculateIfNotAvailable();
+ }
+
+ void getAnalysisUsage(AnalysisUsage &AU) const override;
+
+ bool runOnMachineFunction(MachineFunction &F) override;
+ void releaseMemory() override;
+ void print(raw_ostream &OS, const Module *M) const override;
+};
+}
+#endif