[Bug target/95488] Suboptimal multiplication codegen for v16qi

[crazylht at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95488

--- Comment #1 from Hongtao.liu <crazylht at gmail dot com> ---
I think it's this TYPE_SIGN (TREE_TYPE (REG_EXPR (op1))).