[CIR][NFC] Eliminate ArgInfo structure (#140612) A previous refactoring had reduced the ArgInfo structure to contain a single member, the argument type. This change eliminates the ArgInfo structure entirely, instead just storing the argument type directly in places where ArgInfo had previously been used. This also updates the place where the arg types were previously being copied for a call to CIRGenFunctionInfo::Profile to instead use the stored argument types buffer directly and adds assertions where the calculated folding set ID is used to verify that any match was correct.
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