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Commit 7d88da6a authored by Tim Northover's avatar Tim Northover
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GlobalISel: constrain PHI registers on AArch64. 

Self-referencing PHI nodes need their destination operands to be constrained
because nothing else is likely to do so. For now we just pick a register class
naively.

Patch mostly by Ahmed again.

llvm-svn: 286183
parent 66b326bc
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