Brad King e756328434 Propagate backtraces from LINK_LIBRARIES through to link line items ...

Since commit d4d0dd0f6a (cmLinkLineComputer: Add ComputeLinkLibs
overload with backtraces, 2019-09-13, v3.16.0-rc1~87^2~4), backtraces
have been collected by `ComputeLinkLibs` by looking back through the
link implementation libraries for one matching the text of the link line
item.  This is slow in projects with long link lines.

Instead, teach `cmComputeLinkDepends` and `cmComputeLinkInformation` to
carry backtrace information explicitly along with the text of each item.

Fixes: #20322

2020-02-10 16:11:38 -05:00

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