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

[Matt Arsenault via llvm-commits]

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@@ -3400,7 +3400,7 @@ def : GCNPat<
 // FIXME: Should also do this for readlane, but tablegen crashes on
 // the ignored src1.
 def : GCNPat<
-  (int_amdgcn_readfirstlane (i32 imm:$src)),
+  (i32 (AMDGPUreadfirstlane (i32 imm:$src))),
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arsenm wrote:

We might need to make this fold more sophisticated for other types, but best for a follow up patch 

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