Trunk release notes are now for 4.0.0
Trunk release notes are now for 4.0.0

The 3.9 release are on the 3.9 branch.

git-svn-id: a34e9779ed74578ad5922b3306b3d80a0c825546@275846 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra