[PATCH] [analyzer] Detect duplicate [super dealloc] calls

[David Kilzer]

- Updated help text in `Checkers.td` to be more generic.
- Fix false positive with classes using custom retain counting and containing an ivar that's the same type as the class. Added test case for this condition.
- Extracted duplicate code into isSuperDeallocMessage().
- Small tweaks to variable names.
- Add section headers for [super dealloc] test cases to explain what each one is testing.

http://reviews.llvm.org/D5238

Files:
  lib/StaticAnalyzer/Checkers/Checkers.td
  lib/StaticAnalyzer/Checkers/ObjCSuperDeallocChecker.cpp
  test/Analysis/DeallocUseAfterFreeErrors.m
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