[clang] [Clang][AST][NFC] Move template argument dependence computations for MemberExpr to computeDependence (PR #86682)

[Krystian Stasiowski via cfe-commits]

sdkrystian wrote:

@erichkeane Just merging this PR will result in the commits being squashed into a single commit... is that alright?

https://github.com/llvm/llvm-project/pull/86682