[IR] Move support for dxil::TypedPointerType to LLVM core IR.
This allows the construct to be shared between different backends. However, it
still remains illegal to use TypedPointerType in LLVM IR--the type is intended
to remain an auxiliary type, not a real LLVM type. So no support is provided for
LLVM-C, nor bitcode, nor LLVM assembly (besides the bare minimum needed to make
Type->dump() work properly).
Reviewed By: beanz, nikic, aeubanks
Differential Revision: https://reviews.llvm.org/D130592
GitOrigin-RevId: 2138c906458ed37f0f833b1c7dda1bc6c6be8236
19 files changed
