1c456a8220
This is step two of supporting autoupgrade of old bitcode to opaque pointers. Rather than tracking the element type ID of pointers in particular, track all type IDs that a type contains. This allows us to recover the element type in more complex situations, e.g. when we need to determine the pointer element type of a vector element or function type parameter. Differential Revision: https://reviews.llvm.org/D119339