Create a Template member to be the MemberSpec of a failed TemplVarDecl (#209604) Patch #200092 changed to no longer check the previous var template when setting whether the current one is a member specialization. However, if the previous one was actually an error case (see the example here and in the report), we ended up trying to do that anyway, which caused an assertion. This patch puts in a 'fake' declaration for the not-found declaration after we emit the 'not found' error for the purposes of allowing our diagnostics to continue evaluating these without causing problems. Fixes: #209432 (cherry picked from commit 2c2e43675910603bab1b163655786e4850569d74)
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