ReleaseNotes.rst: Bump version to 3.8

The notes for 3.7 are on the 3.7 branch.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@242238 91177308-0d34-0410-b5e6-96231b3b80d8

docs/ReleaseNotes.rst

 =====================================
-Clang 3.7 (In-Progress) Release Notes
+Clang 3.8 (In-Progress) Release Notes
 =====================================
 
 .. contents::
@@ -10,7 +10,7 @@ Written by the `LLVM Team <http://llvm.org/>`_
 
 .. warning::
 
-   These are in-progress notes for the upcoming Clang 3.7 release. You may
+   These are in-progress notes for the upcoming Clang 3.8 release. You may
    prefer the `Clang 3.6 Release Notes
    <http://llvm.org/releases/3.6.0/tools/clang/docs/ReleaseNotes.html>`_.
 
@@ -18,7 +18,7 @@ Introduction
 ============
 
 This document contains the release notes for the Clang C/C++/Objective-C
-frontend, part of the LLVM Compiler Infrastructure, release 3.7. Here we
+frontend, part of the LLVM Compiler Infrastructure, release 3.8. 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 3.7?
+What's New in Clang 3.8?
 ========================
 
 Some of the major new features and improvements to Clang are listed
@@ -47,10 +47,7 @@ sections with improvements to Clang's support for those languages.
 Major New Features
 ------------------
 
-- Use of the ``__declspec`` language extension for declaration attributes now
-  requires passing the -fms-extensions or -fborland compiler flag. This language
-  extension is also enabled when compiling CUDA code, but its use should be
-  viewed as an implementation detail that is subject to change.
+- Feature1...
 
 Improvements to Clang's diagnostics
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -64,11 +61,6 @@ about them. The improvements since the 3.5 release include:
 New Compiler Flags
 ------------------
 
-The sized deallocation feature of C++14 is now controlled by the
-``-fsized-deallocation`` flag. This feature relies on library support that
-isn't yet widely deployed, so the user must supply an extra flag to get the
-extra functionality.
-
 The option ....
 
 
@@ -116,17 +108,11 @@ OpenCL C Language Changes in Clang
 Internal API Changes
 --------------------
 
-These are major API changes that have happened since the 3.6 release of
+These are major API changes that have happened since the 3.7 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.
 
--  Some of the `PPCallbacks` interface now deals in `MacroDefinition`
-   objects instead of `MacroDirective` objects. This allows preserving
-   full information on macros imported from modules.
-
--  `clang-c/Index.h` no longer `#include`\s `clang-c/Documentation.h`.
-   You now need to explicitly `#include "clang-c/Documentation.h"` if
-   you use the libclang documentation API.
+-  ...
 
 libclang
 --------