[llvm] [DirectX][ShaderFlags] Add analysis for `WaveOps` flag (PR #118140)

[Joshua Batista via llvm-commits]

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@@ -92,6 +115,8 @@ void ModuleShaderFlags::updateFunctionFlags(ComputedShaderFlags &CSF,
 
     // TODO: Set DX11_1_DoubleExtensions if I is a call to DXIL intrinsic
     // DXIL::Opcode::Fma https://github.com/llvm/llvm-project/issues/114554
+
+    CSF.WaveOps |= checkWaveOps(CI->getIntrinsicID());
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bob80905 wrote:

There might be some weird behavior with the uninitialized value at 35 being returned if the switch statmeent on line 36 doesn't enter the case on line 38. checkWaveOps will return this uninitialized value's IsWave member on line 50. 
Or I might be reading this wrong. Is there a way for an uninitialized value to be returned?

https://github.com/llvm/llvm-project/pull/118140