[clang] [llvm] [AMDGPU] Extend readlane, writelane and readfirstlane intrinsic lowering for generic types (PR #89217)

[Matt Arsenault via cfe-commits]

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+# RUN: not --crash llc -mtriple=amdgcn -run-pass=none -verify-machineinstrs -o /dev/null %s 2>&1 | FileCheck %s
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arsenm wrote:

You should not need to introduce any new machine verifier tests, they are not useful. The useful test would be the IR that produces the verifier error, which ideally would be fixed 

https://github.com/llvm/llvm-project/pull/89217