Cleanup the Release Notes for the static analyzer:

Cleanup the Release Notes for the static analyzer:

The performance improvement was committed after the 3.0 branch.
Constructors/destructors are handled by the CFG, but we do not do anything
special for them in the analyzer yet.

Since we do not have an open source release qualification for the analyzer,
we are not investing into creating the proper release notes for it.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@145281 91177308-0d34-0410-b5e6-96231b3b80d8