[PATCH] D103135: [OpaquePtr] Remove existing support for forward compatibility

[Arthur Eubanks via Phabricator via llvm-commits]

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It assumes that PointerType will keep having an optional pointee type,
but we'd like to remove the pointee type in PointerType at some point.

I feel like the current implementation could be simplified anyway,
although perhaps I'm underestimating the amount of work needed
throughout BitcodeReader.

We will still need a side table to keep track of pointee types. This
will be reimplemented at some point.

This is essentially a revert of a4771e9d (which doesn't look like it was
reviewed anyway).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D103135

Files:
  llvm/lib/Bitcode/Reader/BitcodeReader.cpp
  llvm/lib/Bitcode/Reader/ValueList.cpp
  llvm/lib/Bitcode/Reader/ValueList.h

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