Richard Wei 65bffd7ad7 Add _MatchingEngine and _StringProcessing modules. ...

These modules are part of the experimental declarative string processing feature. If accepted to the Standard Library, _StringProcessing will be available via implicit import just like _Concurrency, though _MatchingEngine will still be hidden as an implementation detail.

`_MatchingEngine` will contain the general-purpose pattern matching engine ISA, bytecode, and executor. `_StringProcessing` will contain regular expression and pattern matching APIs whose implementation depends on the matching engine..

Also consolidates frontend flag `-enable-experimental-regex` as `-enable-experimental-string-processing`.

Resolves rdar://85478647.

2021-11-19 09:27:33 -08:00

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