[TensorExpr] Move `SimpleIREval` implementation from .h to .cpp. (#49697)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/49697
Mostly mechanical move. This refactoring helps to hide unnecessary
details from the SimpleIREval interface and make it more similar to a
pure 'codegen'.
Test Plan: Imported from OSS
Reviewed By: nickgg
Differential Revision: D25668696
Pulled By: ZolotukhinM
fbshipit-source-id: 423247bfcdfa88403e8ec92152f00110bb9da19c
Author
Mikhail Zolotukhin
