[llvm] [GlobalISel][ARM] Legalization of G_CONSTANT using constant pool (PR #98308)

[Serge Pavlov via llvm-commits]

spavloff wrote:

> Lowering it at instruction selection is awkward

It is equivalent to the introduction of a pseudo instruction, which is then lowered at the selection phase, no?

https://github.com/llvm/llvm-project/pull/98308