[Concepts] Fix Concepts on generic lambda in a VarTemplateSpecDecl
As fallout of the Deferred Concept Instantiation patch (babdef27), we got a number of reports of a regression, where we asserted when instantiating a constraint on a generic lambda inside of a variable template. See: https://github.com/llvm/llvm-project/issues/57958 The problem was that getTemplateInstantiationArgs function only walked up declaration contexts, and missed that this is not necessarily the case with a lambda (which can ALSO be in a separate context). This patch refactors the getTemplateInstantiationArgs function in a way that is hopefully more readable, and fixes the problem with the concepts on a generic lambda. Differential Revision: https://reviews.llvm.org/D134874
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