[stdlib] Add scala.language.2.13
to the scala 2 files
#23537
Merged
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This is a port of #23102 to the actual
main
branch.In this PR, we add the import
scala.language.2.13
to each and every file in the stdlib that originated from Scala 2.13.The flag changes the behavior of certain part of the compiler to produce code as if we were compiling with Scala 2.13's semantics.