Fix performance of builtins.substring for empty substrings
(cherry picked from commit b2deff1947c2fe57fdbf1a472eb9003eb407f8d3)
Change-Id: I4ddfc8d26a4781c9520fff9807849a073ee7bed8
Nix is a powerful package manager for Linux and other Unix systems that makes package
management reliable and reproducible. Please refer to the Nix manual
for more details.
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