Consistent use of header comment format.

Correct format:
//===--- Name of file - Description ----------------------------*- Lang -*-===//

include/swift/Basic/AssertImplements.h

@@ -1,4 +1,4 @@
-//===- AssertImplements.h - Assert that a class overrides a function ------===//
+//===--- AssertImplements.h - Assert that a class overrides a function ----===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/BlotMapVector.h

@@ -1,4 +1,4 @@
-//===- BlotMapVector.h - Map vector with "blot" operation  ------*- C++ -*-===//
+//===--- BlotMapVector.h - Map vector with "blot" operation  ----*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/Defer.h

@@ -1,4 +1,4 @@
-//===- Defer.h - 'defer' helper macro ---------------------------*- C++ -*-===//
+//===--- Defer.h - 'defer' helper macro -------------------------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/DemangleNodes.def

@@ -1,4 +1,4 @@
-//===-- DemangleNodes.def - Demangling Tree Metaprogramming -----*- C++ -*-===//
+//===--- DemangleNodes.def - Demangling Tree Metaprogramming ----*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/DiagnosticConsumer.h

@@ -1,4 +1,4 @@
-//===- DiagnosticConsumer.h - Diagnostic Consumer Interface -----*- C++ -*-===//
+//===--- DiagnosticConsumer.h - Diagnostic Consumer Interface ---*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/Fallthrough.h

@@ -1,4 +1,4 @@
-//===- Fallthrough.h - switch fallthrough annotation macro ------*- C++ -*-===//
+//===--- Fallthrough.h - switch fallthrough annotation macro ----*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/FlaggedPointer.h

@@ -1,4 +1,4 @@
-//===- FlaggedPointer.h - Explicit pointer tagging container ----*- C++ -*-===//
+//===--- FlaggedPointer.h - Explicit pointer tagging container --*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/Malloc.h

@@ -1,4 +1,4 @@
-//===- Malloc.h - Aligned malloc interface ----------------------*- C++ -*-===//
+//===--- Malloc.h - Aligned malloc interface --------------------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/NullablePtr.h

@@ -1,4 +1,4 @@
-//===- NullablePtr.h - A pointer that allows null ---------------*- C++ -*-===//
+//===--- NullablePtr.h - A pointer that allows null -------------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/OptionSet.h

@@ -1,4 +1,4 @@
-//===-- OptionSet.h - Sets of boolean options -------------------*- C++ -*-===//
+//===--- OptionSet.h - Sets of boolean options ------------------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/Program.h

@@ -1,4 +1,4 @@
-//===- Program.h ------------------------------------------------*- C++ -*-===//
+//===--- Program.h ----------------------------------------------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/QuotedString.h

@@ -1,4 +1,4 @@
-//===- QuotedString.h - Print a string in double-quotes ---------*- C++ -*-===//
+//===--- QuotedString.h - Print a string in double-quotes -------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/Range.h

@@ -1,4 +1,4 @@
-//===- Range.h - Classes for conveniently working with ranges ---*- C++ -*-===//
+//===--- Range.h - Classes for conveniently working with ranges -*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/RelativePointer.h

@@ -1,4 +1,4 @@
-//===-- RelativePointer.h - Relative Pointer Support ------------*- C++ -*-===//
+//===--- RelativePointer.h - Relative Pointer Support -----------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/STLExtras.h

@@ -1,4 +1,4 @@
-//===- STLExtras.h - additions to the STL -----------------------*- C++ -*-===//
+//===--- STLExtras.h - additions to the STL ---------------------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/SourceLoc.h

@@ -1,4 +1,4 @@
-//===- SourceLoc.h - Source Locations and Ranges ----------------*- C++ -*-===//
+//===--- SourceLoc.h - Source Locations and Ranges --------------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/TreeScopedHashTable.h

@@ -1,4 +1,4 @@
-//===- TreeScopedHashTable.h - Hash table with multiple active scopes -----===//
+//===--- TreeScopedHashTable.h - Hash table with multiple active scopes ---===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Basic/Version.h

@@ -1,4 +1,4 @@
-//===- Version.h - Swift Version Number -------------------------*- C++ -*-===//
+//===--- Version.h - Swift Version Number -----------------------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //