[llvm] AMDGPU: Fix gcc build break (PR #161354)

[Matt Arsenault via llvm-commits]

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@@ -4268,7 +4268,10 @@ Register AMDGPUInstructionSelector::copyToVGPRIfSrcFolded(
 
 InstructionSelector::ComplexRendererFns
 AMDGPUInstructionSelector::selectIgnore(MachineOperand &Root) const {
-  return {{}};
+  // Don't render anything.
+  ComplexRendererFns Renderers;
+  Renderers.emplace();
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arsenm wrote:

Don't need this part? 

https://github.com/llvm/llvm-project/pull/161354