Remove the last SPI use of _RegexParser symbols #416
Merged
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PatternConverter uses one last AST-based API defined in _StringProcessing, which is technically not allowed but not
problematic b/c PatternConverter also imports _RegexParser. However, this can have compile-time problems later on, so this changes the entry point for PatternConverter to just use an Any parameter that is checked at runtime to actually be AST.