[llvm] [X86] Remove SlowDivide tuning from GRTTuning (PR #84676)

[via llvm-commits]

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@@ -1237,8 +1237,6 @@ def ProcessorFeatures {
   // Gracemont
   list<SubtargetFeature> GRTTuning = [TuningMacroFusion,
                                       TuningSlow3OpsLEA,
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goldsteinn wrote:

2c latency, but other slow lea is 3c. Bit of a middle ground.

https://github.com/llvm/llvm-project/pull/84676