[llvm] [LAA] Clean up APInt-overflow related code (PR #140048)

[Ramkumar Ramachandra via llvm-commits]

================
@@ -842,19 +842,12 @@ getStrideFromAddRec(const SCEVAddRecExpr *AR, const Loop *Lp, Type *AccessTy,
   TypeSize AllocSize = DL.getTypeAllocSize(AccessTy);
   int64_t Size = AllocSize.getFixedValue();
 
-  // Huge step value - give up.
-  if (APStepVal->getBitWidth() > 64)
----------------
artagnon wrote:

Thanks a lot for the test! The patch does indeed show functional changes now :)

https://github.com/llvm/llvm-project/pull/140048