[llvm] [LV] Support generating masks for switch terminators. (PR #99808)

[via llvm-commits]

================
@@ -104,9 +181,62 @@ define void @switch_all_dests_distinct(ptr %start, ptr %end) {
 ; FORCED-LABEL: define void @switch_all_dests_distinct(
----------------
ayalz wrote:

Sanity check: is it indeed unprofitable to vectorize this case having four distinct destinations, say by VF=4 and UF=1, as decided by COST?

https://github.com/llvm/llvm-project/pull/99808