[Threading] Rename chrono.h to match the namespace name.

rdar://100236038

Author: al45tair

include/swift/Threading/Impl/C11.h

@@ -22,7 +22,7 @@
 
 #include <threads.h>
 
-#include "chrono.h"
+#include "chrono_utils.h"
 
 #include "llvm/ADT/Optional.h"
 

include/swift/Threading/Impl/Darwin.h

@@ -21,7 +21,7 @@
 #include <os/lock.h>
 #include <pthread.h>
 
-#include "chrono.h"
+#include "chrono_utils.h"
 
 #include "llvm/ADT/Optional.h"
 

include/swift/Threading/Impl/Linux.h

@@ -23,7 +23,7 @@
 #include <atomic>
 #include <optional>
 
-#include "chrono.h"
+#include "chrono_utils.h"
 
 #include "llvm/ADT/Optional.h"
 

include/swift/Threading/Impl/Nothreads.h

@@ -19,7 +19,7 @@
 
 #include "llvm/ADT/Optional.h"
 
-#include <chrono>
+#include "chrono_utils.h"
 
 namespace swift {
 namespace threading_impl {

include/swift/Threading/Impl/Pthreads.h

@@ -23,7 +23,7 @@
 #include <atomic>
 #include <cstdint>
 
-#include "chrono.h"
+#include "chrono_utils.h"
 
 #include "llvm/ADT/Optional.h"
 

include/swift/Threading/Impl/Win32.h

@@ -19,7 +19,7 @@
 
 #include "Win32/Win32Defs.h"
 
-#include "chrono.h"
+#include "chrono_utils.h"
 
 #include <atomic>
 

include/swift/Threading/Impl/chrono.h renamed to include/swift/Threading/Impl/chrono_utils.h

@@ -1,4 +1,4 @@
-//===--- chrono.h - Utility functions for duration/time_point - -*- C++ -*-===//
+//===--- chrono_utils.h - Utility functions for duration ------ -*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //
@@ -16,8 +16,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef SWIFT_THREADING_IMPL_CHRONO_H
-#define SWIFT_THREADING_IMPL_CHRONO_H
+#ifndef SWIFT_THREADING_IMPL_CHRONO_UTILS_H
+#define SWIFT_THREADING_IMPL_CHRONO_UTILS_H
 
 #include <chrono>
 #include <type_traits>
@@ -68,4 +68,4 @@ ceil(const std::chrono::duration<Rep, Period>& d)
 } // namespace threading_impl
 } // namespace swift
 
-#endif // SWIFT_THREADING_IMPL_CHRONO_H
+#endif // SWIFT_THREADING_IMPL_CHRONO_UTILS_H