[clang] [llvm] [AMDGPU][WIP] Extend permlane16, permlanex16 and permlane64 intrinsic lowering for generic types (PR #92725)

[Matt Arsenault via cfe-commits]

================
@@ -18479,6 +18479,25 @@ Value *CodeGenFunction::EmitAMDGPUBuiltinExpr(unsigned 
BuiltinID,
         CGM.getIntrinsic(Intrinsic::amdgcn_update_dpp, Args[0]->getType());
     return Builder.CreateCall(F, Args);
   }
+  case AMDGPU::BI__builtin_amdgcn_permlane16:
+  case AMDGPU::BI__builtin_amdgcn_permlanex16: {
+    Intrinsic::ID IID;
+    IID = BuiltinID == AMDGPU::BI__builtin_amdgcn_permlane16
+              ? Intrinsic::amdgcn_permlane16
+              : Intrinsic::amdgcn_permlanex16;
+
+    llvm::Value *Src0 = EmitScalarExpr(E->getArg(0));
+    llvm::Value *Src1 = EmitScalarExpr(E->getArg(1));
+    llvm::Value *Src2 = EmitScalarExpr(E->getArg(2));
----------------
arsenm wrote:

I assume EmitScalarExpr handles the immargs correctly? 

https://github.com/llvm/llvm-project/pull/92725
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