[analyzer] Fix a false positive of the 'self' initialization checker.
A common pattern in classes with multiple initializers is to put the
subclass's common initialization bits into a static function that receives
the value of 'self', e.g:
if (!(self = [super init]))
return nil;
if (!(self = _commonInit(self)))
return nil;
It was reported that 'self' was not set to the result of [super init].
Until we can use inter-procedural analysis, in such a call, transfer the
ObjCSelfInitChecker flags associated with 'self' to the result of the call.
Fixes rdar://
8937441 & http://llvm.org/PR9094
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@124940 91177308-0d34-0410-b5e6-96231b3b80d8