[Bug tree-optimization/87309] [9 Regression] Spurious note: messages when building with -fopt-info-vec-optimized

[iii at linux dot ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87309

--- Comment #4 from Ilya Leoshkevich <iii at linux dot ibm.com> ---
Do we also need to test m_test_pp_flags?
At least dump_context::emit_item does it.