Raphael Isemann ddedf0f9bb Set MustBuildLookupTable on PrimaryContext in ExternalASTMerger ...

Summary:
`MustBuildLookupTable` must always be called on a primary context as we otherwise
trigger an assert, but we don't ensure that this will always happen in our code right now.

This patch explicitly requests the primary context when doing this call as this shouldn't break
anything (as calling `getPrimaryContext` on a context which is its own primary context is a no-op)
but will catch these rare cases where we somehow operate on a declaration context that is
not its own primary context.

See also D54863.

Reviewers: martong, a.sidorin, shafik

Reviewed By: martong

Subscribers: davide, rnkovacs, cfe-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D54898

llvm-svn: 347863

2018-11-29 13:50:30 +00:00

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