[Clang] Fix crash with `source_location` in lambda declarators. (#107411)

Parsing lambdas require pushing a declaration context for the lambda, so
that parameters can be attached to it, before its trailing type is
parsed. DAt that point, partially-parsed lambda don't have a name that
can be computed for then.
This would cause source_location::current() to crash when use in the
decltype of a lambda().
We work around this by producing a source_location for an enclosing
scope in that scenario.

Fixes #67134

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