Reorganize test main file

Kolja Brixrequested to merge
kbrix/eigen:tidy_test_main_h into master

What does this implement/fix?

Reorganize test main file main.h as discussed with @rmlarsen1 in !515 (merged).

  • Move random matrix generators to separate file random_matrix_helper.h
  • Protect forward declarations with EIGEN_COMP_ICC.

Reference issue

See also !515 (merged).

Edited by Rasmus Munk Larsen

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