[clang] [Clang][Modules] Fix generic lambda local capture mapping mismatch in template instantiation (PR #202248)

[James Y Knight via cfe-commits]

jyknight wrote:

> @ipopov ipopov force-pushed the fix-modules-generic-lambda-capture branch from 23489db to 2672ae5 

BTW, it's nicer to not to force-push PR branches, and instead to just keep adding new commits on top with each additional change. That way it's easier, in the github UI, to see what the changes have been since last review.

https://github.com/llvm/llvm-project/pull/202248