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[lldb] Forcefully complete a type when adding nested classes

Authored by labath on Aug 14 2020, 5:21 AM.

Description

[lldb] Forcefully complete a type when adding nested classes

With -flimit-debug-info, we can run into cases when we only have a class
as a declaration, but we do have a definition of a nested class. In this
case, clang will hit an assertion when adding a member to an incomplete
type (but only if it's adding a c++ class, and not C struct).

It turns out we already had code to handle a similar situation arising
in the -gmodules scenario. This extends the code to handle
-flimit-debug-info as well, and reorganizes bits of other code handling
completion of types to move functions doing similar things closer
together.

Differential Revision: https://reviews.llvm.org/D85968