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diff --git a/clang-r353983/include/llvm/Analysis/Trace.h b/clang-r353983/include/llvm/Analysis/Trace.h
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+//===- llvm/Analysis/Trace.h - Represent one trace of LLVM code -*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This class represents a single trace of LLVM basic blocks.  A trace is a
+// single entry, multiple exit, region of code that is often hot.  Trace-based
+// optimizations treat traces almost like they are a large, strange, basic
+// block: because the trace path is assumed to be hot, optimizations for the
+// fall-through path are made at the expense of the non-fall-through paths.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_TRACE_H
+#define LLVM_ANALYSIS_TRACE_H
+
+#include <cassert>
+#include <vector>
+
+namespace llvm {
+
+class BasicBlock;
+class Function;
+class Module;
+class raw_ostream;
+
+class Trace {
+  using BasicBlockListType = std::vector<BasicBlock *>;
+
+  BasicBlockListType BasicBlocks;
+
+public:
+  /// Trace ctor - Make a new trace from a vector of basic blocks,
+  /// residing in the function which is the parent of the first
+  /// basic block in the vector.
+  Trace(const std::vector<BasicBlock *> &vBB) : BasicBlocks (vBB) {}
+
+  /// getEntryBasicBlock - Return the entry basic block (first block)
+  /// of the trace.
+  BasicBlock *getEntryBasicBlock () const { return BasicBlocks[0]; }
+
+  /// operator[]/getBlock - Return basic block N in the trace.
+  BasicBlock *operator[](unsigned i) const { return BasicBlocks[i]; }
+  BasicBlock *getBlock(unsigned i)   const { return BasicBlocks[i]; }
+
+  /// getFunction - Return this trace's parent function.
+  Function *getFunction () const;
+
+  /// getModule - Return this Module that contains this trace's parent
+  /// function.
+  Module *getModule () const;
+
+  /// getBlockIndex - Return the index of the specified basic block in the
+  /// trace, or -1 if it is not in the trace.
+  int getBlockIndex(const BasicBlock *X) const {
+    for (unsigned i = 0, e = BasicBlocks.size(); i != e; ++i)
+      if (BasicBlocks[i] == X)
+        return i;
+    return -1;
+  }
+
+  /// contains - Returns true if this trace contains the given basic
+  /// block.
+  bool contains(const BasicBlock *X) const {
+    return getBlockIndex(X) != -1;
+  }
+
+  /// Returns true if B1 occurs before B2 in the trace, or if it is the same
+  /// block as B2..  Both blocks must be in the trace.
+  bool dominates(const BasicBlock *B1, const BasicBlock *B2) const {
+    int B1Idx = getBlockIndex(B1), B2Idx = getBlockIndex(B2);
+    assert(B1Idx != -1 && B2Idx != -1 && "Block is not in the trace!");
+    return B1Idx <= B2Idx;
+  }
+
+  // BasicBlock iterators...
+  using iterator = BasicBlockListType::iterator;
+  using const_iterator = BasicBlockListType::const_iterator;
+  using reverse_iterator = std::reverse_iterator<iterator>;
+  using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+
+  iterator                begin()       { return BasicBlocks.begin(); }
+  const_iterator          begin() const { return BasicBlocks.begin(); }
+  iterator                end  ()       { return BasicBlocks.end();   }
+  const_iterator          end  () const { return BasicBlocks.end();   }
+
+  reverse_iterator       rbegin()       { return BasicBlocks.rbegin(); }
+  const_reverse_iterator rbegin() const { return BasicBlocks.rbegin(); }
+  reverse_iterator       rend  ()       { return BasicBlocks.rend();   }
+  const_reverse_iterator rend  () const { return BasicBlocks.rend();   }
+
+  unsigned                 size() const { return BasicBlocks.size(); }
+  bool                    empty() const { return BasicBlocks.empty(); }
+
+  iterator erase(iterator q)               { return BasicBlocks.erase (q); }
+  iterator erase(iterator q1, iterator q2) { return BasicBlocks.erase (q1, q2); }
+
+  /// print - Write trace to output stream.
+  void print(raw_ostream &O) const;
+
+  /// dump - Debugger convenience method; writes trace to standard error
+  /// output stream.
+  void dump() const;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_ANALYSIS_TRACE_H