[llvm] AMDGPU: Make bf16/v2bf16 legal types (PR #76215)

[Pierre van Houtryve via llvm-commits]

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@@ -3901,6 +3958,26 @@ SDValue SITargetLowering::lowerPREFETCH(SDValue Op, SelectionDAG &DAG) const {
   return Op;
 }
 
+// Work around DAG legality rules only based on the result type.
+SDValue SITargetLowering::lowerFP_EXTEND(SDValue Op, SelectionDAG &DAG) const {
+  bool IsStrict = Op.getOpcode() == ISD::STRICT_FP_EXTEND;
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Pierre-vh wrote:

tiny tiny nit: put parentheses around the initializer - `=` and `==` on each side of an expression is just a bit confusing at first glance

https://github.com/llvm/llvm-project/pull/76215