Fix <rdar://problem/6451816>:

- Because of the introduction of AnonTypedRegions when reasoning about casts, we
  had a regression in the "symbolication" of variable values passed-by-reference
  to a function. This is now fixed in CFRefCount.cpp (-checker-cfref) by
  blasting through the layer of AnonTypedRegions when symbolicating the value of
  the variable. This logic may get moved elsewhere. Note that this change
  affects only -checker-cfref and not -checker-simple; eventually this logic
  should get pulled out of CFRefCount.cpp into a more common place. All users
  use -checker-cfref by default, and -checker-simple should probably just be
  removed.  
- Updated test 'Analysis/uninit-vals-ps.c' to only use -checker-cfref and added
  a test case for this regression.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@61147 91177308-0d34-0410-b5e6-96231b3b80d8

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