[Bug target/44551] [missed optimization] AVX vextractf128 after vinsertf128

[kretz at kde dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44551

--- Comment #18 from Matthias Kretz <kretz at kde dot org> ---
FWIW, the issue is resolved on trunk. GCC8.2 still has the missed optimization:
https://godbolt.org/z/hbgIIi