[clang][dataflow] Process terminator condition within `transferCFGBlock()`. (#77750) In particular, it's important that we create the "fallback" atomic at this point (which we produce if the transfer function didn't produce a value for the expression) so that it is placed in the correct environment. Previously, we processed the terminator condition in the `TerminatorVisitor`, which put the fallback atomic in a copy of the environment that is produced as input for the _successor_ block, rather than the environment for the block containing the expression for which we produce the fallback atomic. As a result, we produce different fallback atomics every time we process the successor block, and hence we don't have a consistent representation of the terminator condition in the flow condition. This patch includes a test (authored by ymand@) that fails without the fix.
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