Include Scaling.h in IterativeSolvers module

Pavel Guzenfeldrequested to merge
PavelGuzenfeld/eigen:fix/iterscaling-include into master

Summary

  • Add the missing #include "src/IterativeSolvers/Scaling.h" to the IterativeSolvers umbrella header
  • IterScaling was documented but unreachable without a direct path include

Test plan

  • #include <unsupported/Eigen/IterativeSolvers> compiles
  • IterScaling can be instantiated and used

Closes #3002 (closed)

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