[Bug target/69120] sse2_shufpd_v2df_mask has wrong name

[kyukhin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69120

--- Comment #2 from Kirill Yukhin <kyukhin at gcc dot gnu.org> ---
Looked closely.
The name was chosen intentionally to simplify "sse2_shufpd<mask_expand4_name>"
expand. If we want to fix this name - new subst attribute need to be introduced
and 
if (<mask_expand4_applied>) 
  emit_insn (avx512vl_...
else
  emit_insn (sse2_...
inserted into the expand.

Beside of the expand this template never called by name.

So, I bet to have the name unchanged and keep things simple.