generic methods

[jmesserly]

This is a tracking bug for generic methods:

Above the line is P1

• static checking for generic methods (in Analyzer), see Statically type check "generic" methods  #300
• runtime support in DDC's code generator, see Reify type in "generic" methods #301
• SDK uses generic methods, see sdk generic method support #434
• instantiated tear-offs, see support instantiated tear-offs #525
• async generic methods, see Generic calls don't work with async #538

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• universal function types, see support universal function types #526
• generic function expressions, set support generic lambda expressions #527
• validate type bounds in dynamic calls, see validate type bounds in dynamic generic method call #532
• tests for dynamic generic function calls, see tests for dynamic calls to generic functions/methods #533
• improve RTTI representation, see improve generic method RTTI #539
• language (parser) tests for generic methods, see pull in generic method tests #535
• handle generic method overriding a non-generic, see generic methods should be able to override non-generic ones. #459

(original discussion & proposal at #28)

[jmesserly]

Initial impl is done, I'm going to close this one out, all of the unfinished bugs are still out there and open.