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If a vreg's bank is specified in the registers block and one of its defs or uses also specifies the bank, we end up checking that the RegBank is equal to diagnose conflicting banks. The problem comes up for generic vregs, where we weren't fully initializing the VRegInfo when parsing the registers block, so we'd end up comparing a null pointer to uninitialized memory. This fixes a non-deterministic failure when round tripping through MIR with generic vregs. llvm-svn: 318543
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