Unless I'm just missing something, I don't see how introducing CFLAGS_NODIST and LDFLAGS_NODIST to 2.7 would introduce instability. It should be a fairly non-invasive change, restricted to configure and the Makefile; both vars should usually be empty and thus builds should be entirely unaffected unless options like --with-lto are chosen.
On a separate note about the patch: as mentioned in msg251305, it's probably better to restrict adding the LTO flags to just the profile-opt targets, even with the --with-lto check.