[llvm] GlobalISel needs fdiv 1 / sqrt(x) to rsq combine (PR #78673)

[Pierre van Houtryve via llvm-commits]

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@@ -334,6 +336,19 @@ bool AMDGPUPostLegalizerCombinerImpl::matchRcpSqrtToRsq(
   return false;
 }
 
+void AMDGPUPostLegalizerCombinerImpl::applyOneFDivSqrtToRsq(
+    MachineInstr &MI, const Register &X) const {
+  // B.setInstrAndDebugLoc(MI);
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Pierre-vh wrote:

This should already be set so you can delete it - the combiner will automatically set the insertion point to the MI being looked at 

https://github.com/llvm/llvm-project/pull/78673