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The PBQP::RegAlloc::MatrixMetadata class assumes that matrices have at least two rows/columns (for the spill option plus at least one physreg). This patch ensures that that invariant is met by pre-spilling vregs that have no physreg options so that no node (and no corresponding edges) need be added to the PBQP graph. This fixes a bug in an out-of-tree target that was identified by Jonas Paulsson. Thanks for tracking this down Jonas! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227942 91177308-0d34-0410-b5e6-96231b3b80d8
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