1. C++ implementations of ilaver to report the Eigen version number.  Though you could make the argument that it should report the LAPACK test suite number that this passes.
2.  xLAMCH implementation using <limits>. I can simplify the code for sfmin further because I know which branch of the if statement it takes.
3. Because xLAMCH and xLAMC2 live in the same fortran file, our overlay technique for testing LAPACK runs into problems because of linker issues. So we also split that function into its own file.
4. The timing functions do not need to be compiled into the LAPACK library so they have been removed.

PiperOrigin-RevId: 381028293
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