Improve -Winfinite-recursion

Summary: Rewrites -Winfinite-recursion to remove the state dictionary and explore paths in loops - especially infinite loops.  The new check now detects recursion in loop bodies dominated by a recursive call.

Reviewers: rsmith, rtrieu

Reviewed By: rtrieu

Subscribers: lebedev.ri, cfe-commits

Differential Revision: https://reviews.llvm.org/D43737

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@328173 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed