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LArROD: Make numerically more robust.

Scott Snyder requested to merge ssnyder/athena:prec.LArROD-20220427 into master

In loops like

      for (size_t i=0;i<len;++i) {

change to compute the intermediate results in double precision. Otherwise, the results may change depending on whether FMA instructions are used.

Fixes test failure seen on aarch64. However, this may cause tiny changes in the calorimeter cell reconstruction.

Edited by Scott Snyder

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