[PATCH] Add new warning to Clang to detect when all code paths in a function has a call back to the function.

[Richard Trieu]

  Switch -Winfinite-recursion to DefaultIgnore, in line with the other CFG warnings.  This allows the other tests to be reverted.  Also made the suggested changes from Richard Smith.

http://llvm-reviews.chandlerc.com/D1864

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1864?vs=5147&id=5691#toc

Files:
  test/SemaCXX/warn-infinite-recursion.cpp
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Basic/DiagnosticGroups.td
  lib/Sema/AnalysisBasedWarnings.cpp
  lib/Lex/Pragma.cpp
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