[InstCombine] clean up wrap propagation for reassociated ops; NFCI

Always true/false checks were flagged by static analysis;
https://bugs.llvm.org/show_bug.cgi?id=43143

I have not confirmed the logic difference in propagating nsw vs. nuw,
but presumably we would have noticed a bug by now if that was wrong.

llvm-svn: 370248
1 file changed
tree: 7a432486e54710dbd7984537bf9a90a9be83edf3
  1. clang/
  2. clang-tools-extra/
  3. compiler-rt/
  4. debuginfo-tests/
  5. libclc/
  6. libcxx/
  7. libcxxabi/
  8. libunwind/
  9. lld/
  10. lldb/
  11. llgo/
  12. llvm/
  13. openmp/
  14. parallel-libs/
  15. polly/
  16. pstl/
  17. .arcconfig
  18. .clang-format
  19. .clang-tidy
  20. .gitignore
  21. README.md
README.md

The LLVM Compiler Infrastructure

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.