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In preparation for supporting ILP32 on AArch64, this modifies the SelectionDAG
builder code so that pointers are allowed to have a larger type when "live" in
the DAG compared to memory.
Pointers get zero-extended whenever they are loaded, and truncated prior to
stores. In addition, a few not quite so obvious locations need updating:
* A GEP that has not been marked inbounds needs to enforce the IR-documented
2s-complement wrapping at the memory pointer size. Inbounds GEPs are
undefined if they overflow the address space, so no additional operations
are needed.
* Signed comparisons would give incorrect results if performed on the
zero-extended values.
This shouldn't affect CodeGen for now, but will become active when the AArch64
ILP32 support is committed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@359676 91177308-0d34-0410-b5e6-96231b3b80d8
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