[PATCH] Warn on suspicious increments/decrements in for loops

[Richard Trieu]

Add a new warning to -Wloop-analysis to warn on questionable increments/decrements in for loop bodies.  This warning triggers when the last statement in the loop is the same as the third expression in the for-loop header and there is no continue statements in the loop body.

Idea for this warning came from PR15636
http://llvm.org/bugs/show_bug.cgi?id=15636

http://llvm-reviews.chandlerc.com/D628

Files:
  test/SemaCXX/warn-loop-analysis.cpp
  include/clang/Basic/DiagnosticGroups.td
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/Sema/SemaStmt.cpp
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