Pavel Yaskevich 29cb7ddbcb [Diagnostics] Handle ambiguities related to use of nil literal ...

When `nil` is passed as an argument to call with multiple overloads
it's possible that this would result in ambiguity where matched
expected argument type doesn't conform to `ExpressibleByNilLiteral`.

To handle situations like this locator for contextual mismatch
has to be adjusted to point to the call where `nil` is used, so
`diagnoseAmbiguityWithFixes` can identify multiple overloads and
produce a correct ambiguity diagnostic.

Resolves: rdar://75514153

2021-05-05 12:56:25 -07:00

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