[analyzer] Remove unneeded 'inlineCall' checker callback.

I believe the removed assert in CheckerManager says it best:

	InlineCall is a special hacky callback to allow intrusive
	evaluation of the call (which simulates inlining). It is
	currently only used by OSAtomicChecker and should go away
	at some point.

OSAtomicChecker has gone away; inlineCall can now go away as well!

llvm-svn: 165865