Revert "[Analyzer][CFG] Correctly handle rebuilt default arg and default init...

Revert "[Analyzer][CFG] Correctly handle rebuilt default arg and default init expression (#91879)" (#94597)

This depends on https://github.com/llvm/llvm-project/pull/92527 which
needs to be reverted due to
https://github.com/llvm/llvm-project/pull/92527#issuecomment-2149120420.

This reverts commit 905b402a

.

Co-authored-by: Bogdan Graur <bgraur@google.com>