[llvm] [DA] factor out repetitive code in GCD test (NFCI) (PR #189461)

[Ruoyu Qiu via llvm-commits]

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@@ -2212,6 +2212,25 @@ bool DependenceInfo::accumulateCoefficientsGCD(const SCEV *Expr,
   return accumulateCoefficientsGCD(Start, CurLoop, CurLoopCoeff, RunningGCD);
 }
 
+// Compute running GCD and record source constant.
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cabbaken wrote:

The comment ("source" should be deleted now) needs to be refined.

https://github.com/llvm/llvm-project/pull/189461