Revert "[analyzer] Re-apply r283093 "Add extra notes to ObjCDeallocChecker""

Revert:
r283662: [analyzer] Re-apply r283093 "Add extra notes to ObjCDeallocChecker"
r283660: [analyzer] Fix build error after r283660 - remove constexpr strings.

It was causing an internal build bot to fail. It looks like in some cases
adding an extra note can cause scan-build plist output to drop a diagnostic
altogether.

llvm-svn: 284317