Joe Groff 993d795152 KeyPath: Fix out-of-bounds access when instantiating keypaths with optional chaining components. ...

When we pre-scan the components of a key path pattern to determine its runtime type and instance size, we would short-circuit upon seeing an optional-chaining component, since that makes a key path definitely read-only, but the loop also accumulates the size of the instance we're supposed to allocate, so…bad stuff happened. Leave out the short-circuit, fixing SR-6096 | rdar://problem/34889333 .

2017-11-02 13:32:35 -07:00

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