[analyzer] Add diagnostic in ObjCDeallocChecker for use of -dealloc instead of -release.

[analyzer] Add diagnostic in ObjCDeallocChecker for use of -dealloc instead of -release.

In dealloc methods, the analyzer now warns when -dealloc is called directly on
a synthesized retain/copy ivar instead of -release. This is intended to find mistakes of
the form:

- (void)dealloc {
  [_ivar dealloc]; // Mistaken call to -dealloc instead of -release

  [super dealloc];
}

rdar://problem/16227989

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@262729 91177308-0d34-0410-b5e6-96231b3b80d8