[llvm] AMDGPU/GlobalISel: RegBankLegalize G_ANYEXT s16 to s64 (PR #205470)

[Petar Avramovic via llvm-commits]

https://github.com/petar-avramovic commented:

do you have ll test? Think this should be dealt with in legalizer, ext to 32 then 64 instead of directly to 64.

https://github.com/llvm/llvm-project/pull/205470