[llvm] [DXIL] Implement pow lowering (PR #86733)

[Farzon Lotfi via llvm-commits]

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@@ -197,6 +198,26 @@ static bool expandLog10Intrinsic(CallInst *Orig) {
   return expandLogIntrinsic(Orig, numbers::ln2f / numbers::ln10f);
 }
 
+static bool expandPowIntrinsic(CallInst *Orig) {
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farzonl wrote:

@bob80905  If you feel strongly about this you or I could put up a pr converting the expansion functions to  void and returning true in the switch statements.  I don't think aesthetics should trump understanding of intent of the bools. 

https://github.com/llvm/llvm-project/pull/86733