[CIR][NFCI] Add some infrastructure for function attributes (#176433) While looking into the work required to add attributes to functions/arguments/etc, I discovered a lot of overlap with calling conventions, which I know others are working on. Rather than risk a later conflict, this patch adds some basic infrastructure that will hopefully limit the fallout. This patch is NFC as it doesn't modify the IR at all, just adds a few calls to the 'right place' and adds some arguments. Additionally, it adds the calling convention type to the IR, but leaves it empty, as it is useful to be able to pass around but not particularly possible to define/make do anything yet.
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