Clear the release notes for 5.0.0

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@291837 91177308-0d34-0410-b5e6-96231b3b80d8

docs/ReleaseNotes.rst

 =======================================
-Clang 4.0.0 (In-Progress) Release Notes
+Clang 5.0.0 (In-Progress) Release Notes
 =======================================
 
 .. contents::
@@ -10,15 +10,15 @@ Written by the `LLVM Team <http://llvm.org/>`_
 
 .. warning::
 
-   These are in-progress notes for the upcoming Clang 4.0.0 release. You may
-   prefer the `Clang 3.9 Release Notes
-   <http://llvm.org/releases/3.9.0/tools/clang/docs/ReleaseNotes.html>`_.
+   These are in-progress notes for the upcoming Clang 5 release. You may
+   prefer the `Clang 4 Release Notes
+   <http://llvm.org/releases/4.0.0/tools/clang/docs/ReleaseNotes.html>`_.
 
 Introduction
 ============
 
 This document contains the release notes for the Clang C/C++/Objective-C
-frontend, part of the LLVM Compiler Infrastructure, release 4.0.0. Here we
+frontend, part of the LLVM Compiler Infrastructure, release 5.0.0. Here we
 describe the status of Clang in some detail, including major
 improvements from the previous release and new feature work. For the
 general LLVM release notes, see `the LLVM
@@ -36,7 +36,7 @@ main Clang web page, this document applies to the *next* release, not
 the current one. To see the release notes for a specific release, please
 see the `releases page <http://llvm.org/releases/>`_.
 
-What's New in Clang 4.0.0?
+What's New in Clang 5.0.0?
 ==========================
 
 Some of the major new features and improvements to Clang are listed
@@ -47,10 +47,6 @@ sections with improvements to Clang's support for those languages.
 Major New Features
 ------------------
 
-- The ``diagnose_if`` attribute has been added to clang. This attribute allows
-  clang to emit a warning or error if a function call meets one or more
-  user-specified conditions.
-
 -  ...
 
 Improvements to Clang's diagnostics
@@ -61,13 +57,6 @@ Improvements to Clang's diagnostics
 New Compiler Flags
 ------------------
 
-The option -Og has been added to optimize the debugging experience.
-For now, this option is exactly the same as -O1. However, in the future,
-some other optimizations might be enabled or disabled.
-
-The option -MJ has been added to simplify adding JSON compilation
-database output into existing build systems.
-
 The option ....
 
 New Pragmas in Clang
@@ -127,7 +116,7 @@ OpenMP Support in Clang
 Internal API Changes
 --------------------
 
-These are major API changes that have happened since the 3.9 release of
+These are major API changes that have happened since the 4.0.0 release of
 Clang. If upgrading an external codebase that uses Clang as a library,
 this section should help get you past the largest hurdles of upgrading.
 
@@ -143,9 +132,6 @@ libclang
 
 ...
 
-With the option --show-description, scan-build's list of defects will also
-show the description of the defects.
-
 
 Static Analyzer
 ---------------