Refine Montgomery GPU helpers to avoid kernel branching

PerfectNumbers.Core/Gpu/Kernels/DivisorByDivisorKernels.cs

@@ -17,7 +17,7 @@ internal static class DivisorByDivisorKernels
         }
 
         ulong exponent = exponents[index];
-        hits[index] = ULongExtensions.Pow2MontgomeryModWindowedGpu(divisor, exponent, keepMontgomery: false) == 1UL ? (byte)1 : (byte)0;
+        hits[index] = ULongExtensions.Pow2MontgomeryModWindowedGpuConvertToStandard(divisor, exponent) == 1UL ? (byte)1 : (byte)0;
     }
 
     public static void ComputeRemainderDeltasKernel(Index1D index, ArrayView<ulong> gaps, ArrayView<byte> deltas, byte modulus)
@@ -149,6 +149,6 @@ internal static class DivisorByDivisorKernels
 
         ulong exponent = exponents[index];
 
-        results[index] = ULongExtensions.Pow2MontgomeryModWindowedGpu(divisor, exponent, keepMontgomery: true);
+        results[index] = ULongExtensions.Pow2MontgomeryModWindowedGpuKeepMontgomery(divisor, exponent);
     }
 }