John McCall a7c5c80799 Compute class metadata bounds solely from class-descriptor chain information. ...

Change the "metadata base offset" variable into a "class metadata bounds"
variable that contains the base offset and the +/- bounds on the class.
Link this variable from the class descriptor when the class has a resilient
superclass; otherwise, store the +/- bounds there.  Use this variable to
compute the immediate-members offset for various runtime queries.  Teach the
runtime to fill it in lazily and remove the code to compute it from the
generated code for instantiation.  Identify generic arguments with the start
of the immediate class metadata members / end of the {struct,enum} metadata
header and remove the generic-arguments offset from generic type descriptors.

2018-03-04 02:14:32 -05:00

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