[Bug target/112537] Is there a way to disable cpymem pass for rvv

[juzhe.zhong at rivai dot ai via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112537

--- Comment #6 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
We can add 

  if (!flag_tree_vectorize)
    return false;

in riscv_vector::expand_block_move

But I am not sure whether other RISC-V folks is happy with that.

CCing other folks to see whether they allow it.