[PATCH] D149133: [clang][Interp] BaseToDerived casts

[Timm Bäder via Phabricator via cfe-commits]

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  We can implement these similarly to DerivedToBase casts. We just have to
  walk the class hierarchy, sum the base offsets and subtract it from the
  current base offset of the pointer.

As a side-effect, this also changes the `BaseToDerived` casts to only emit //one// opcode instead of one per base cast.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149133

Files:
  clang/lib/AST/Interp/ByteCodeExprGen.cpp
  clang/lib/AST/Interp/ByteCodeExprGen.h
  clang/lib/AST/Interp/Interp.cpp
  clang/lib/AST/Interp/Interp.h
  clang/lib/AST/Interp/Opcodes.td
  clang/lib/AST/Interp/Pointer.h
  clang/test/AST/Interp/records.cpp

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