Replace instances of EIGEN_CONSTEXPR macro

Tyler Venessrequested to merge
calcmogul/eigen:replace-instances-of-eigen-constexpr-macro into master

Macros.h just defines it to constexpr. BFloat16.h and Half.h were left alone since they redefine the macro. The inline keyword was removed from constexpr functions since they're already implicitly inline.

Edited by Tyler Veness

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