[CSFix] Delay missing unwrap
locator simplification until diagnostic
#26376
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Instead of keeping two locators in the fix let's store only the
original locator and simplify it later in process of emitting
a diagnostic. That helps to avoid some duplicate work as well
as makes sure that locators supplied to the diagnostic always
have an anchor.
Resolves: rdar://problem/53344815
Resolves: rdar://problem/53238058