Joe Groff 65a4531467 IRGen/Runtime: Make key path pattern format true-const. ...

Use relative references instead of pointers so that the pattern can be true-const. Instead of trying
to instantiate a constant key path literal in-place, point to a cache variable that we can store
a pointer to the shared instance into when instantiated. Now that the pattern format has diverged
significantly from the instance format, simplify and refactor the instantiation code using a walker
for the pattern format instead of trying to reuse the code for working with instantiated instances.
rdar://problem/42674576

2018-11-05 12:30:49 -08:00

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