[llvm] [GlobalISel][AArch64] Legalize G_EXTRACT_SUBVECTOR for SVE (PR #114519)

[Thorsten Schütt via llvm-commits]

tschuett wrote:

We select G_TRUNC in C++, I bet zpr is missing:
https://github.com/llvm/llvm-project/blob/8cb6b65542591e6bdbd70d94a8ae74b13ab2e5c0/llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp#L3267

https://github.com/llvm/llvm-project/pull/114519