[PATCH] Don't crash on reporting lambda diagnostics

[Aaron Ballman]

PR23021 demonstrates a case where diagnostic reporting on an inner
lambda would crash due to a null pointer dereference. Since captures
happen from calling ParseParameterDeclarationClause, which is before
the semantic lambda object is created, another mechanism is required
to get the lambda introducer location.

This patch addresses it by storing the introducer location into the
scope object directly, and using that location when reporting the
diagnostics. The result is the same, but no longer relies on a lambda
object being created first.

~Aaron
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