Slava Pestov 198e8d1a1f AST: Introduce a new debug-only mangling for @escaping @convention(block) functions ...

Our mangling did not encode if an Objective-C block was escaping or
not. This is not a huge problem in practice, but for debug info we
want type reconstruction to round-trip exactly. There was a previous
workaround to paper over this specific problem.

Remove the workaround, and add a new 'XL' mangling for escaping
blocks. Since we don't actually want to break ABI compatibility,
only use the new mangling in DWARF debug info.

2019-06-12 19:10:19 -07:00

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