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diff --git a/third_party/llvm-project/include/llvm/Support/Signals.h b/third_party/llvm-project/include/llvm/Support/Signals.h
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+++ b/third_party/llvm-project/include/llvm/Support/Signals.h
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+//===- llvm/Support/Signals.h - Signal Handling support ----------*- 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 file defines some helpful functions for dealing with the possibility of
+// unix signals occurring while your program is running.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_SIGNALS_H
+#define LLVM_SUPPORT_SIGNALS_H
+
+#include <string>
+
+namespace llvm {
+class StringRef;
+class raw_ostream;
+
+namespace sys {
+
+  /// This function runs all the registered interrupt handlers, including the
+  /// removal of files registered by RemoveFileOnSignal.
+  void RunInterruptHandlers();
+
+  /// This function registers signal handlers to ensure that if a signal gets
+  /// delivered that the named file is removed.
+  /// Remove a file if a fatal signal occurs.
+  bool RemoveFileOnSignal(StringRef Filename, std::string* ErrMsg = nullptr);
+
+  /// This function removes a file from the list of files to be removed on
+  /// signal delivery.
+  void DontRemoveFileOnSignal(StringRef Filename);
+
+  /// When an error signal (such as SIGABRT or SIGSEGV) is delivered to the
+  /// process, print a stack trace and then exit.
+  /// Print a stack trace if a fatal signal occurs.
+  /// \param Argv0 the current binary name, used to find the symbolizer
+  ///        relative to the current binary before searching $PATH; can be
+  ///        StringRef(), in which case we will only search $PATH.
+  /// \param DisableCrashReporting if \c true, disable the normal crash
+  ///        reporting mechanisms on the underlying operating system.
+  void PrintStackTraceOnErrorSignal(StringRef Argv0,
+                                    bool DisableCrashReporting = false);
+
+  /// Disable all system dialog boxes that appear when the process crashes.
+  void DisableSystemDialogsOnCrash();
+
+  /// Print the stack trace using the given \c raw_ostream object.
+  void PrintStackTrace(raw_ostream &OS);
+
+  // Run all registered signal handlers.
+  void RunSignalHandlers();
+
+  using SignalHandlerCallback = void (*)(void *);
+
+  /// Add a function to be called when an abort/kill signal is delivered to the
+  /// process. The handler can have a cookie passed to it to identify what
+  /// instance of the handler it is.
+  void AddSignalHandler(SignalHandlerCallback FnPtr, void *Cookie);
+
+  /// This function registers a function to be called when the user "interrupts"
+  /// the program (typically by pressing ctrl-c).  When the user interrupts the
+  /// program, the specified interrupt function is called instead of the program
+  /// being killed, and the interrupt function automatically disabled.
+  ///
+  /// Note that interrupt functions are not allowed to call any non-reentrant
+  /// functions.  An null interrupt function pointer disables the current
+  /// installed function.  Note also that the handler may be executed on a
+  /// different thread on some platforms.
+  void SetInterruptFunction(void (*IF)());
+
+  /// Registers a function to be called when an "info" signal is delivered to
+  /// the process.
+  ///
+  /// On POSIX systems, this will be SIGUSR1; on systems that have it, SIGINFO
+  /// will also be used (typically ctrl-t).
+  ///
+  /// Note that signal handlers are not allowed to call any non-reentrant
+  /// functions.  An null function pointer disables the current installed
+  /// function.  Note also that the handler may be executed on a different
+  /// thread on some platforms.
+  void SetInfoSignalFunction(void (*Handler)());
+} // End sys namespace
+} // End llvm namespace
+
+#endif