Reduce the size of a recent update_persistent_hash() performance
regression. The key builder (701dc4ed) added field names to the hash key which ended up slowing things down. Example (in pytential test suite, loads ~110 times from cache): PYOPENCL_TEST=port \ time -p python test_layer_pot_eigenvalues.py \ "test_ellipse_eigenvalues(cl._csc, 1, 5, 3, False)" * Prior to 701dc4ed: real 21.68 user 21.06 sys 2.03 * As of 701dc4ed: real 27.11 user 26.59 sys 1.94 * As of this commit: real 22.29 user 21.90 sys 1.86 This commit doesn't make everything as fast as it used to be because pymbolic expressions are still stringified before hashing. However, caching (#67) will eventually help with that too.
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