[clang] [clang][analyzer][NFCi] Pass if bind is to a Decl or not to checkBind (PR #152137)

[Balazs Benics via cfe-commits]

https://github.com/steakhal commented:

We use UpperCamelCase style for variable names, including parameter names.

Have you checked if any of the checkBind users used an `isa` or `dyncast` as a proxy to determine if its an assignment expression or an initialization?
I suspect there could have been cases where they tried to use this as a proxy, that we could not substitute to this explicit flag instead.

https://github.com/llvm/llvm-project/pull/152137