[llvm] [LV] Improve AnyOf reduction codegen. (PR #78304)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

the test failure is along the lines of some entries in an vector changing from

...
"foo7277bar"
"foo99126bar"
"foo27480bar"
"foo27099bar"
...

to

...
"foo7277barf"
"oo99126barf"
"oo27480barf"
"oo27099barf"
...

https://github.com/llvm/llvm-project/pull/78304