IR: Add ConstantData, for operand-less Constants
Add a common parent `ConstantData` to the constants that have no
operands. These are guaranteed to represent abstract data that is in no
way tied to a specific Module.
This is a good cleanup on its own. It also makes it simpler to disallow
RAUW (and factor away use-lists) on these constants in the future. (I
have some experimental patches that make RAUW illegal on ConstantData,
and they seem to catch a bunch of bugs...)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@261464 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed