[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 -stop-after=amdgpu-isel -mtriple=amdgcn-- -mcpu=gfx900 -verify-machineinstrs -o - %s 2>&1 | FileCheck %s
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arsenm wrote:

This is not an IR verifier test, it is a codegen test that fails the machine verifier. A machine verifier would go in test/MachineVerifier, and preferably would be written in MIR and not rely on codegen.


I thought the point of this test was to show that the selection did not produce a machine verifier error after selection, so this is broken 

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