Revert "Preserve whitespace and comments during lexing as Trivia"

This reverts commit d6e2b58382.

include/swift/Basic/String.h

@@ -1,94 +0,0 @@
-//===--- String.h - String storage ------------------------------*- C++ -*-===//
-//
-// This source file is part of the Swift.org open source project
-//
-// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
-// Licensed under Apache License v2.0 with Runtime Library Exception
-//
-// See http://swift.org/LICENSE.txt for license information
-// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
-//
-//===----------------------------------------------------------------------===//
-//
-//  This file defines the 'String' storage wrapper, which can hold its own
-//  unique copy of a string, or merely hold a reference to some point in a
-//  source buffer, which is assumed to live at least as long as a value of
-//  this type.
-//
-//===----------------------------------------------------------------------===//
-#ifndef SWIFT_BASIC_STRING_H
-#define SWIFT_BASIC_STRING_H
-
-#include "llvm/ADT/IntrusiveRefCntPtr.h"
-#include "llvm/ADT/StringRef.h"
-
-using llvm::StringRef;
-
-namespace swift {
-
-class String {
-  const char *Data;
-  size_t Length;
-  bool Managed;
-
-
-  static const char *copyBuffer(const String &Other) {
-    auto Buffer = (char *)malloc(Other.str().size());
-    memcpy(Buffer, Other.str().data(), Other.str().size());
-    return Buffer;
-  }
-
-public:
-  String() : Data(nullptr), Length(0), Managed(false) {}
-
-  String(const char *Data, size_t Length, bool Managed)
-    : Data(Data), Length(Length), Managed(Managed) {}
-
-  String(StringRef Str, bool IsManaged = false)
-    : String(Str.data(), Str.size(), IsManaged) {}
-
-  String(const String &Other)
-    : Data(Other.Managed ? copyBuffer(Other) : Other.Data), Length(Other.Length),
-      Managed(Other.Managed) {}
-
-  static String createManaged(const char *Str, size_t Length) {
-    auto Buffer = malloc(Length);
-    memcpy(Buffer, Str, Length);
-    return String { reinterpret_cast<const char *>(Buffer), Length,
-                            /* Managed */ true };
-  }
-
-  static String createManaged(StringRef Str) {
-    return createManaged(Str.data(), Str.size());
-  }
-
-  static String createUnmanaged(StringRef Str) {
-    return String { Str, /* Managed */ false };
-  }
-
-  size_t size() const {
-    return Length;
-  }
-
-  bool empty() const {
-    return Length == 0;
-  }
-
-  StringRef str() const {
-    return StringRef { Data, Length };
-  }
-
-  bool operator==(const String &Right) const {
-    return str() == Right.str();
-  }
-
-  ~String() {
-    if (Managed)
-      free(reinterpret_cast<void *>(const_cast<char *>(Data)));
-  }
-};
-
-} // end namespace swift
-
-#endif // SWIFT_BASIC_STRING_H
-